198 F9.1, second part: a one-to-one substitution, then each move in the three compiled libraries (mixed matrix triples, keyword triples, Nihilist squares): exact 9 substitution then transposition
reverted
0/24
0 38 s unclocked 197 F9.1: a one-to-one letter substitution, then each hand transposition built since 0106 (compass routes, keyword shapes, keyed blanks, row reshuffles, French diagonal, EVA, Chiffre XIII, YAR, the plate layout, the poem code): exact 9 substitution then transposition
reverted
0/24
0 70 s unclocked Pivot P16: F5 Gromark → F9 substitution, then a move 196 F5.1: Gromark with multiplicative feedback (each digit the product of two earlier ones) on a free mixed alphabet, bases 2-16 and 26, every primer: exact; YAR as a primer by subsumption 5 gromark lfsr
reverted
0/24
0 56 s unclocked 195 F5.2: Gromark on a free mixed alphabet: three-term rules in bases 2-9, 11-16 and 26, and two-term rules with longer lags (base 10 to 8, other bases to 6): exact 5 gromark lfsr
reverted
0/24
0 3 min unclocked Pivot P15: F8 Hill → F5 Gromark 194 F8.1: Hill 2x2 with an unknown one-to-one letter numbering (any of 26!), every invertible matrix, both alignments: exact; 3x3 counted and blocked 8 hill
reverted
0/24
0 8 min unclocked 193 F8.1: Hill 2x2 with an unknown one-to-one letter numbering (any of 26!), every invertible matrix, both alignments: exact; 3x3 counted and blocked 8 hill
error
0/24
0 0 s unclocked Pivot P14: F11 agency hand systems, now public → F8 Hill 192 F11.4: Friedman's keyed alphabet box (MC III 35b): the alphabet written n times into a rectangle as wide as a keyword, read out in the keyword's column order as the key stream; every dictionary keyword: exact 11 agency hand systems
reverted
0/24
0 26 s unclocked 191 F11.3: the CIA's Polish agent key box: a key text written into a box by rows and read out by columns, then a reciprocal or other table; K1-K3, the Morse and Carter's book as key texts: exact 11 agency hand systems
reverted
0/24
0 11 s unclocked 190 F11.2: the SOE poem code: a double columnar transposition keyed by consecutive words of K1-K3 and the Morse, then or before a repeating key on the sculpture's tables: exact 11 agency hand systems
reverted
0/24
0 5 s unclocked 189 F11.1: the US Army's M-94 cylinder (25 published discs) in any disc order, any cipher row per group of 25, any group alignment: exact 11 agency hand systems
reverted
0/24
0 0 s unclocked Pivot P13: F10 alphabets that change after every letter → F11 agency hand systems, now public 188 F10.2: Wheatstone's cryptograph (a 27-place plain ring against a 26-letter cipher ring, the hands moved by the distance between plaintext letters), free or word-mixed cipher ring: exact 10 self changing alphabets
reverted
0/24
0 10 s unclocked 187 F10.1: Chaocipher with the left (cipher) wheel started from any keyword-mixed alphabet at any rotation and the right (plain) wheel free: exact 10 self changing alphabets
reverted
0/24
0 74 s unclocked Pivot P12: F4 Sanborn's visual systems → F10 alphabets that change after every letter 186 F4.3: the places of the copper's physical anomalies (the four ?, K2's omitted letter, the raised YAR, the extra L, the long and short lines) as the number half of a two-part key, exact 4 sanborn visual
reverted
0/24
0 2 s unclocked 185 F4.2: trifid with a free 27-symbol cube at periods 16-97, every alignment, by constraint propagation: exact 4 sanborn visual
reverted
0/24
0 6 s unclocked 184 F4.1: routes that follow the copper's physical layout (K4's four lines starting after K3's tail and the ?, the lower plate, the whole left side), then or before a repeating key: exact 4 sanborn visual
reverted
0/24
0 2 s unclocked Pivot P11: F2 masked plaintext → F4 Sanborn's visual systems 183 F2.3: a 26-letter phrase with repeated letters as the plain strip, so a letter may be enciphered from any of its places (homophones that keep the length), repeating key 1-26: exact 2 masked plaintext
reverted
0/24
0 4 s unclocked 182 F2.2: nulls placed by any rule, which for a repeating or progressive key act only through the number of nulls between the two known runs (0-29): exact 2 masked plaintext
reverted
0/24
0 4 s unclocked 181 F2.1: after striking out every copy of one or two letters, the plaintext a repeating key of 24 or 25 forces outside the known runs, matched against the dictionary 2 masked plaintext
reverted
0/24
0 2 s unclocked Pivot P10: F3 a two-part key with a combiner → F2 masked plaintext 180 F3.7: 'point' read as the decimal point in K2's six point five, or as punctuation (the copper's four ?, K2's ? and X stops), as the number half of a two-part key, exact 3 two component key
reverted
0/24
0 2 s unclocked 179 F3.6: the Weltzeituhr's rotating ring of 24 time zones as the number half of a two-part key over 26 letters, with an unknown word, exact 3 two component key
reverted
0/24
0 3 s unclocked 178 F3.5: the misspelt letters' positions (IQLUSION, UNDERGRUUND, DESPARATLY, the missing E, the raised YAR) and their shifts as the number half of a two-part key, exact 3 two component key
reverted
0/24
0 2 s unclocked 177 F3.4: Scheidt's patent with two keyed tables and three repeating keys (N = 2), tables from the KRYPTOS order and its inverse, key lengths 1-10 each: exact 3 two component key
reverted
0/24
0 33 min unclocked 176 F3.3: EAST NORTHEAST and its parts read as numbers (bearing 67.5 degrees, compass points of 32 and 16, mils) as the number half of a two-part key, with an unknown word, exact 3 two component key
reverted
0/24
0 2 s unclocked 175 F3.2: the Morse E counts and the plate's line lengths as the number half of a two-part key, each reading with an unknown word, exact 3 two component key
reverted
0/24
0 3 s unclocked 174 F3.1: a puzzle word and a dictionary word joined by a combiner other than plain addition: through a table on a third, keyword-mixed alphabet, or by multiplication 3 two component key
reverted
0/24
0 5 s unclocked 173 F3.1: Scheidt's patent sandwich, a shift, a keyed table, a second shift and a second table, two repeating keys of length 1-13 each: exact 3 two component key
reverted
0/24
0 2 min Pivot P9: F12 Stein's way: look, quantify, then crib → F3 a two-part key with a combiner 172 F12.6: Stein's breakthrough, probable words: common English and K1-K3 words placed at every position in the free-alphabet cells the known letters leave undecided, decided exactly 12 steins way
reverted
0/24
0 30 min unclocked 171 F12.5: K4 as two parts with their own repeating keys, split between the two known runs, on the sculpture's tables: exact, with the checks each part leaves 12 steins way
reverted
0/24
0 39 s unclocked 170 F12.4: a pencil session: K4 written out at widths 7, 8, 13, 14, 21, 24 and 31, six patterns noted by eye, each then tested against 1,000 shuffles 12 steins way
reverted
0/24
0 3 min unclocked 169 F12.3: Stein's index-of-coincidence peak at 13 alphabets in K1 and K2: real or chance, against shuffles that keep each part's own key period 12 steins way
reverted
0/24
0 68 s unclocked 168 F12.2: Stein's way, step one: K4's statistics by segment and by width (letter counts per segment, index of coincidence for 1-48 alphabets, repeats at widths 7, 21 and 31), each against 1,000 shuffles, with the number of comparisons stated 12 steins way
reverted
0/24
0 4 min unclocked Pivot P8: F6 a move, then the table → F12 Stein's way: look, quantify, then crib 167 F6.14: the Nihilist transposition on a 10 x 10 square with three blank cells, one key of every order for rows and columns, then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 5 min unclocked 166 F6.12, F6.13, F6.15: the Czech EVA double triangle and Chiffre XIII's five-row mask with its period-5 table, and the YAR '1-2-3' orderings, then the table 6 transposition then tableau
reverted
0/24
0 2 min unclocked 165 F6.10, F6.18, F6.19: blank cells placed by the keyword, letters reshuffled inside rows at widths 2-48, and the French diagonal method, then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 86 s unclocked 164 F6.11, F6.16, F6.17: keyword-disrupted and triangle columnar, interrupted-key columnar and trapezoid transpositions, every dictionary keyword, then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 4 min unclocked 163 F6.9: ciphertext and plaintext autokey, every lag, joined to 0084's double columnar routes (one stage of width 7 in all 5,040 orders), either order, on the sculpture's tables 6 transposition then tableau
reverted
0/24
0 6 min unclocked 162 F6.8: three-stage routes with at least one keyword columnar stage (puzzle and K1-K3 words), the others any of the four column readings at widths 2-24, then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 3 min unclocked 161 F6.7: change, move, change with the two keyed stages on different tables (standard then KRYPTOS, or the reverse), key lengths 2-14 each, solved exactly 6 transposition then tableau
reverted
0/24
0 3 min unclocked 160 F6.6: move, change, move again: a grid reading or K3's rule, then a repeating key on the table, then a second move, every pair from a library of 950 moves 6 transposition then tableau
reverted
0/24
0 2 min unclocked 159 F6.5: the message written in rows and read off along a compass direction (each of the 16 points, and east then east-northeast or northeast in two stages), then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 35 s unclocked 158 F6.3b: every mixed triple of matrix readings with a width of 25 or more, enumerated exactly, then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 6 min unclocked Pivot P7: F1 one keyed stage, no move (reopened) → F6 a move, then the table 157 F1.11: a split key phrase: its first part mixes the plain alphabet, its second the cipher alphabet, the whole phrase is the repeating key 1 keyed periodic
reverted
0/24
0 36 s unclocked 156 F1.10: Friedman's keyword-only key-advance schedules (run length by letter value, the CHRISTMAS expansion, EXTINGUISHER windows; ciphertext and plaintext interruptors; fraction-digit runs) on the sculpture's tables, exact, with scrambled copies 1 keyed periodic
reverted
0/24
0 66 s unclocked 155 F1.9: progressive keys, per-letter and per-repeat, every step and period 1-52, on the standard, KRYPTOS and every dictionary keyword table, against scrambled copies (Kryha's step of 3 included) 1 keyed periodic
reverted
0/24
0 7 min unclocked 154 F1.8: Carter's book as a running key on one unknown alphabet (both directions, every offset, three forms), solved exactly; and how many checks two unknown alphabets would leave for each running-key source 1 keyed periodic
reverted
0/24
0 24 min unclocked 153 F1.8: Carter's book as a running key on one unknown alphabet (both directions, every offset, three forms), solved exactly; and how many checks two unknown alphabets would leave for each running-key source 1 keyed periodic
error
0/24
0 31 min unclocked 152 F1.6, Hill controls: the same 5,044 single-letter errors on ten scrambled copies, against K4's 257 living Hill settings with a check 1 keyed periodic
reverted
0/24
0 5 min unclocked 151 F1.6, third part: every single-letter error in the copper (wrong, missing or extra, anywhere) through the exact Hill (sizes 2-5, plain and affine) and trifid (free cube) verdicts 1 keyed periodic
reverted
0/24
0 64 s unclocked 150 F1.6, second part: one carved letter wrong at a known place, or one letter missing or extra, through the exact free-alphabet Gromark verdicts (base 10 two- and three-term, other bases) 1 keyed periodic
reverted
0/24
0 24 min unclocked 149 F1.7: ciphertext and plaintext autokey on one unknown alphabet (both sides, any of 26! orders), every lag, three forms, decided exactly 1 keyed periodic
reverted
0/24
0 2 min unclocked 148 F1.6, the revived cell: K1 and K2's own system (one free alphabet, added form) at key length 19 with the carved S at place 33 taken as a slip; design 2's power on planted texts and K4 against its copies 1 keyed periodic
reverted
1.6%
24/24
1 18 min unclocked 147 F1.6: one carved letter wrong at a known place, or one letter missing or extra between the known runs, run through the exact tests for one and two unknown alphabets at every key length 1 keyed periodic
reverted
0/24
0 14 min unclocked 146 F1.2 decided at key length 8 with design 2 on two free alphabets: K4 against 12 copies of itself that keep the known places 1 keyed periodic
reverted
0/24
0 7 min unclocked 145 F1.2 at key length 8: design 2 on two free alphabets, its power on planted English against copies that keep the known places (0143's unfinished cell) 1 keyed periodic
reverted
0/24
0 12 min unclocked 144 F1.2 decided at key lengths 13 and 16 with design 2 on two free alphabets: K4 against 12 copies of itself that keep the known places 1 keyed periodic
reverted
0/24
0 14 min unclocked 143 F1.2: design 2 carried to two free alphabets (Quagmire IV), its power measured on planted English at key lengths 8, 13 and 16 against copies that keep the known places 1 keyed periodic
reverted
0/24
0 29 min unclocked 142 F1.1 at key length 26 decided with design 2: K4 against 12 scrambled copies of itself (one free alphabet, Beaufort form) 1 keyed periodic
reverted
1.7%
24/24
1 6 min unclocked 141 F1.1 at key length 26 decided with design 2 (K4 against its own copies); design 2 carried to two free alphabets (Quagmire IV) and its power measured at F1.2's lengths 8, 13 and 16 1 keyed periodic
error
0/24
0 30 min unclocked 140 F1.1 decided with F1.5's design 2: K4 against 12 scrambled copies of itself at key length 23 (one free alphabet, Beaufort form); design 2's power at length 26 1 keyed periodic
reverted
1.7%
24/24
1 16 min unclocked 139 F1.5 design 2: parallel tempering in the set that keeps the known letters, measured on planted English against scrambled copies of itself (one free alphabet, Beaufort form, key length 23) 1 keyed periodic
reverted
0/24
0 26 min unclocked 138 F1.5 design 1, checked: is the climb's power at key length 23 about English order? Each planted text against scrambled copies of itself 1 keyed periodic
reverted
0/24
0 31 min unclocked 137 F1.5 design 1: a climb that never breaks the 24 known letters, run in compiled code, measured on planted English before K4 (one free alphabet, Beaufort form, key lengths 23 and 26) 1 keyed periodic
reverted
1.7%
24/24
2 13 min 136 Which undecided cells could any English test decide? Each blocked cell's key, in bits, against what 73 unknown letters of English can carry 1 keyed periodic
reverted
0/24
0 11 min Pivot P6: F6 a move, then the table → F1 one keyed stage, no move (reopened) 135 Hand padding at each grid stage: the blank cells in any of eight places, dropped or carried as fillers into the next grid, one or two stages, then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 2 min unclocked 134 Two and three matrix stages in mixed readings (turn either way, Sanborn's rows-then-columns-down, and its reverse), then or before a repeating key on the table 6 transposition then tableau
reverted
0/24
0 5 min unclocked 133 Two alphabets in unknown orders (Quagmire IV) after or before every move of the type-1 library: exact at key lengths 1-10 on K4 and ten coppers, the per-slot test at 11-26 6 transposition then tableau
reverted
0/24
0 10 min unclocked 132 Two alphabets in unknown orders (Quagmire IV) after or before every move of the type-1 library: exact at key lengths 1-10 on K4 and ten coppers, the per-slot test at 11-26 6 transposition then tableau
reverted
0/24
0 29 min 131 Every move of the type-1 library, then a table built on two alphabets in unknown orders (Quagmire IV), key lengths 1-26, decided exactly 6 transposition then tableau
reverted
0/24
0 29 min unclocked 130 A table built on one alphabet in an unknown order, then every move of the type-1 library, key lengths 1-26, decided exactly 6 transposition then tableau
reverted
0/24
0 17 min unclocked 129 Every move of the type-1 library, then a table built on one alphabet in an unknown order, key lengths 1-26, decided exactly 6 transposition then tableau
reverted
0/24
0 31 min Pivot P5: F1 one keyed stage, no move → F6 a move, then the table 128 The hand schedules 0126 never reached: stutter, back and forth, triangle and square steps, restart at each carved line, and the tableau rows as keys, tested exactly against 30 coppers 1 keyed periodic
reverted
0/24
0 3 min unclocked 127 Replication: the skip schedule on two unknown alphabets, where K4 had more consistent settings than ten coppers (0126), against 30 fresh coppers with every setting covered 1 keyed periodic
reverted
0/24
0 9 min unclocked 126 Hand key schedules: the tableau rows as keys ('layer two'), a keyword stepped by skip, stutter, back-and-forth, triangle and square rules, and restarted at each carved line; each tested exactly on fixed, free and paired alphabets 1 keyed periodic
reverted
0/24
0 30 min 125 If the key were running English text: do the key letters forced at EASTNORTHEAST and BERLINCLOCK read as English under any of the 208,062 dictionary-word alphabets, better than on scrambled coppers? 1 keyed periodic
reverted
0/24
0 5 min 124 Replication: two unknown alphabets fit K4 at key length 19, where 3 of 100 scrambled coppers fit; against 1,000 fresh coppers, corrected for looking at every length, and against copies that keep the known places' letters 1 keyed periodic
reverted
0/24
0 9 min unclocked 123 Two alphabets in unknown orders, one for the message and one for the carved letters (Quagmire IV), no move: which key lengths 1-26 can any pair fit, and is that unusual against scrambled coppers? 1 keyed periodic
reverted
0/24
0 31 s unclocked 122 Two alphabets in unknown orders, one for the message and one for the carved letters (Quagmire IV), no move: which key lengths 1-26 can any pair fit, and is that unusual against scrambled coppers? 1 keyed periodic
error
0/24
0 6 s unclocked 121 Two alphabets in unknown orders, one for the message and one for the carved letters (Quagmire IV), no move: which key lengths 1-26 can any pair fit, and is that unusual against scrambled coppers? 1 keyed periodic
error
0/24
0 9 s unclocked 120 The two key lengths a free alphabet survives (Beaufort form, 23 and 26): climb the alphabet toward English with the 24 known letters fixed, against scrambled coppers at equal effort 1 keyed periodic
reverted
1.8%
24/24
2 28 min 119 One alphabet in an unknown order on both sides of the table (Quagmire III), no move: does any order fit the 24 known letters, key lengths 1-26, solved exactly? 1 keyed periodic
reverted
0/24
0 11 min Pivot P4: the sweep across the eight directions → F1 first, then the ranked order of work 118 Ciphertext autokey that runs on from K3: the key is the carved letter some distance back, K3's letters included 1 keyed periodic
reverted
0/24
0 7 s unclocked 117 The sculpture's texts as a running key plus one constant shift of the table, with or without a K3-style move 1 keyed periodic
reverted
0/24
0 19 min unclocked 116 A Hill matrix and a repeating key on the table, in either order: 'matrix codes', then 'back to this table' 8 hill polygraphic
reverted
0/24
0 2 min unclocked 115 Two key words added, one from the puzzle and one from the whole dictionary (key word/s, layer two) 3 two component key
reverted
0/24
0 6 min unclocked 114 AMSCO, a column shuffle with cells of one and two letters, keyed by any English word, with a repeating key 6 transposition then tableau
reverted
0/24
0 8 min unclocked 113 The rail fence and the redefence (rails read in any order), with a repeating key before or after 6 transposition then tableau
reverted
0/24
0 80 s unclocked 112 Double columnar with the same English word both times, with a repeating key before or after 6 transposition then tableau
reverted
0/24
0 3 min unclocked 111 A Myszkowski transposition keyed by any English word with a repeated letter, with a repeating key before or after 6 transposition then tableau
reverted
0/24
0 5 min unclocked 110 A column shuffle keyed by any English word, with a repeating key before or after 6 transposition then tableau
reverted
0/24
0 8 min unclocked 109 Tables built from any English word, not just the puzzle's, with a repeating key of length 1 to 26 1 keyed periodic
reverted
0/24
0 4 min unclocked 108 K4 read from the back of the screen, each carved line right to left, with a repeating key or an autokey 4 visual spatial
reverted
0/24
0 84 s unclocked 107 Gromark with a three-term digit rule and any mixed alphabet at all 5 gromark lfsr
reverted
0/24
0 2 min unclocked 106 A one-to-one letter substitution with every move built so far: paths, mixed turns, triple turns and the type-1 library 9 substitution then transposition
reverted
0/24
0 2 min unclocked 105 Affine Hill ciphers of size 2 to 5, solved from every known letter, not only whole blocks 8 hill polygraphic
reverted
0/24
0 2 min unclocked 104 The message as its own key, read through K3's counting rule: key letter for place i is the message letter at a + b i mod 97 1 keyed periodic
reverted
0/24
0 6 s unclocked 103 The copper as its own key, read through K3's counting rule: key letter for place i is the carved letter at a + b i mod 97 1 keyed periodic
reverted
0/24
0 30 s unclocked 102 The period-3 free-alphabet excess, against 400 scrambled coppers and 400 that keep K4's width-21 columns 6 transposition then tableau
reverted
0/24
0 3 min unclocked 101 An interrupted key: the key word starts again at the first letter of every word of the message 1 keyed periodic
reverted
0/24
0 42 s unclocked 100 The three marginal excesses of experiments 92, 93 and 97, recounted as distinct check sets against fifty fresh scrambled coppers 6 transposition then tableau
reverted
0/24
0 2 min unclocked 99 Two quarter turns in mixed directions (clockwise then anticlockwise, and the reverse), with a repeating key 6 transposition then tableau
reverted
0/24
0 42 s unclocked 98 A running key from the sculpture's texts on an unknown mixed alphabet, the table 'slightly different' 1 keyed periodic
reverted
0/24
0 8 min unclocked 97 A repeating key on unknown mixed alphabets (a free Quagmire) after or before a K3-style move 6 transposition then tableau
reverted
0/24
0 16 min unclocked 96 Which two-stage recipe, a move and a table, makes both of K4's width fingerprints at once 7 construction simulation
reverted
0/24
0 22 s unclocked 95 Words a riddle would use, dragged across K4 at every repeating-key length the known letters allow 1 keyed periodic
reverted
0/24
0 25 s unclocked 94 One letter dropped or added in carving, with a K3-style move and a repeating key on the true length 6 transposition then tableau
reverted
0/24
0 13 min unclocked 93 One carved letter wrong, through a K3-style move and a repeating key 6 transposition then tableau
reverted
0/24
0 12 min unclocked 92 The message written into a grid along one path and read out along another (snake, spiral, diagonal), with a repeating key before or after 2 masked plaintext
reverted
0/24
0 4 min unclocked 91 The Berlin clock as a key schedule, joined to a K3-style move before or after the table 6 transposition then tableau
reverted
0/24
0 19 min unclocked 90 A running key concealed at the sculpture, joined to a K3-style move before or after it 6 transposition then tableau
reverted
0/24
0 4 min 89 The key letter behind each K4 letter: K4's carved lines laid over the tableau plate, straight or folded 4 visual spatial
reverted
0/24
0 76 s 88 A key word over the columns plus a shift that changes every m letters, the carved lines of 31 among them 3 two component key
reverted
0/24
0 12 s 87 A key word over the columns and a second key over the rows: the message in rows of seven, each letter shifted by its column's letter and its row's letter 3 two component key
reverted
0/24
0 2 min unclocked Pivot P3: 6 transposition then tableau → 3 two-component key 86 The ? before OBKR as the 98th letter: a full 7 x 14 grid, turned so the ? comes out first, with an autokey or a repeating key 6 transposition then tableau
reverted
0/24
0 7 min unclocked 85 Column shuffles keyed by the puzzle's words, read the right way round this time: once or twice, with a repeating key or an autokey 6 transposition then tableau
reverted
0/24
0 12 min unclocked 84 Two column shuffles, one of them seven columns wide in any of its 5,040 orders, with a repeating key before or after 6 transposition then tableau
reverted
0/24
0 18 min 83 Three grid turns in a row at every width, then (or before) a repeating key: the triple matrix, exhaustively 6 transposition then tableau
reverted
0/24
0 13 min 82 The grid by hand: blank cells at the top, or filler letters carried through the second turn, then a repeating key 6 transposition then tableau
reverted
0/24
0 3 min 81 A grid turn or K3's rule joined to an autokey, the message (or the cipher) feeding its own key, in both orders 6 transposition then tableau
reverted
0/24
0 10 min 80 Change, turn, change again: a repeating key on the table, a K3-style grid turn, then a second repeating key, solved exactly 6 transposition then tableau
reverted
0/24
0 6 min 79 The Berlin clocks as the key: lamp counts of the set-theory clock and the hours on the World Clock, minute by minute 1 keyed periodic
reverted
0/24
0 2 min 78 Sanborn's own letters as the key: his 1989 note to CIA staff, the 1991 dedication pages, and his 2025 open letter 1 keyed periodic
reverted
0/24
0 3 min 77 Both fingerprints at once: every row of seven reshuffled, and the self-feeding autokey at every distance 1 keyed periodic
reverted
0/24
0 5 min 76 Gromark with any mixed alphabet, in number bases other than ten 5 gromark lfsr
reverted
0/24
0 3 min 75 Are the doubled letters fillers? Three of them carry known letters; the other three are struck out 2 masked plaintext
reverted
0/24
0 55 s 74 A mask that changes letters: the alphabet counted in steps of 3, 5, 7 ... or backwards, before the table 2 masked plaintext
reverted
0/24
0 63 s 73 The message as its own key, plus a repeating secret word on top 1 keyed periodic
reverted
0/24
0 2 min 72 The 32 points of the compass and the words of Sanborn's last hint as alphabets 1 keyed periodic
reverted
0/24
0 72 s 71 Sanborn's own table, slightly different from the carved one: every alphabet one step away from KRYPTOS 1 keyed periodic
reverted
0/24
0 2 min 70 Every block of seven letters reshuffled the same way, before or after the table 6 transposition then tableau
reverted
0/24
0 89 s 69 Gromark with any mixed alphabet at all, not just ones built from the puzzle's words 5 gromark lfsr
reverted
0/24
0 2 min 68 The self-feeding autokey again, allowing one carved letter to be wrong, missing or extra 1 keyed periodic
reverted
0/24
0 2 min 67 Two earlier carved letters as the key at once, with or without a short repeating word 1 keyed periodic
reverted
0/24
0 57 s 66 The previous carved letters as a key, plus a repeating secret word on top 1 keyed periodic
reverted
0/24
0 38 s 65 Which ways of making a cipher put the doubled letters in one column of seven? 7 construction simulation
reverted
0/24
0 58 s 64 The scrambled text as its own key, on tables rebuilt from the solved messages' words 1 keyed periodic
reverted
0/24
0 2 min unclocked 63 A column shuffle combined with the scrambled text as its own key, in either order 6 transposition then tableau
reverted
0/24
0 2 min 62 Which ways of making a cipher leave the copper's two real fingerprints? 7 construction simulation
reverted
0/24
0 2 s unclocked 61 A puzzle word plus the misspelled letters as a second, short secret word 3 two component key
reverted
71.3%
8/24
1 32 s 60 The map reference at the end of K2, used as the number table of a Hill cipher 8 hill polygraphic
reverted
85.1%
4/24
4 6 s unclocked 59 Two secret words in two passes, on tables rebuilt from the solved messages' words 3 two component key
reverted
0/24
0 14 s unclocked 58 The table first, then a column shuffle keyed by a word from the solved messages, once or twice 6 transposition then tableau
reverted
0/24
0 5 min 57 Filler letters chosen by letter: drop every copy of one or two letters, then the repeating secret word 2 masked plaintext
reverted
0/24
0 2 s unclocked 56 Are the copper's two odd patterns odd at all once every width is counted? 7 construction simulation
reverted
0/24
0 14 s unclocked 55 Hill again, with the letters numbered by alphabets built from the solved messages' words 8 hill polygraphic
reverted
14.7%
21/24
50 10 s unclocked 54 Number keys that grow by a rule, on tables rebuilt from the words of the solved messages 5 gromark lfsr
reverted
0/24
0 12 s 53 The repeating secret word again, on tables rebuilt from the words of the solved messages 1 keyed periodic
reverted
0/24
0 86 s 52 Ciphers that cannot write all 26 letters, or cannot write an odd number of them 8 hill polygraphic
reverted
0/24
0 0 s unclocked 51 Could K4 be its own letters rearranged? A count of the known letters against the carved ones 6 transposition then tableau
reverted
0/24
0 1 s unclocked 50 The copper off by one letter, through the two-word test on tables rebuilt from the puzzle's words 3 two component key
reverted
23/24
2 5 min unclocked 49 Long keys with a shape: two puzzle words joined, a word and its mirror, a word doubled, at the periods the cribs allow 1 keyed periodic
reverted
0/24
0 4 min 48 The last corner of family 1: both alphabets rebuilt from the puzzle's words, key completed at periods 27 to 29, sampled 1 keyed periodic
reverted
1.7%
24/24
3 12 min 47 Carter's book and the sculpture's own texts as running keys, on tables rebuilt from the puzzle's words 1 keyed periodic
reverted
0/24
0 8 min 46 Gromark with three-term rules and the bases 16 to 26 that experiment 28 left alive 5 gromark lfsr
reverted
0/24
0 2 min 45 The earlier messages as a running key, on tables rebuilt from the puzzle's words 1 keyed periodic
reverted
0/24
0 2 min 44 Hill again, with the letters numbered by every alphabet the puzzle's words can build 8 hill polygraphic
reverted
19.0%
21/24
50 33 s 43 Two key words in two passes, on tables rebuilt from the puzzle's words 3 two component key
reverted
0/24
0 76 s 42 A progressive key on a table rebuilt from the puzzle's words 1 keyed periodic
reverted
0/24
0 26 min 41 Routes beyond columns: spirals, snakes and diagonals through a grid, tested in both orders 6 transposition then tableau
reverted
0/24
0 73 s 40 Trifid with a free cube: the 24 known letters as equations on the cube's coordinates, solved exactly 4 visual spatial
reverted
0/24
0 32 s 39 Trifid with a free cube: the 24 known letters as equations on the cube's coordinates, solved exactly 4 visual spatial
error
0/24
0 2 min 38 A key word plus a number from the sculpture's own story: dates, the Morse counts, and 97 itself as the second component 3 two component key
reverted
0/24
0 58 s 37 Sanborn's triple matrixes: three grid stages in a row, sampled, then the tableau 6 transposition then tableau
reverted
0/24
0 3 min 36 The Hill variants Bauer left open: blocks chained to their neighbours, and two matrices taking turns 8 hill polygraphic
reverted
0/24
0 2 min 35 The same key completion at periods 27 to 29, with the table rebuilt from the puzzle's words 1 keyed periodic
reverted
1.8%
24/24
3 22 min 34 Finish the job at the surviving periods: fix the 24 forced key letters, climb the rest by English, and see how English the text can get 1 keyed periodic
reverted
1.9%
24/24
18 25 min 33 Trifid: the 27-cell cube that fractionates letters, with keyword cubes tested exactly and free cubes annealed 4 visual spatial
reverted
0/24
0 5 min 32 Sanborn's matrix with a key letter per row: write the message in rows of width w, encipher each row with one letter of the key 6 transposition then tableau
reverted
0/24
0 54 s 31 The copper off by one letter: the chained autokey and the two-word tests rerun with a letter dropped or added anywhere 1 keyed periodic
reverted
0/24
0 66 s 30 The text as its own key: the ciphertext under every index rule, and the message keyed by itself backwards 1 keyed periodic
reverted
0/24
0 79 s 29 Bean's closeness made a test: is there an alphabet pair under which every known letter moves only a little? 1 keyed periodic
reverted
0/24
0 62 s 28 Gromark in bases 2 to 9: the even bases that reproduce the width-21 repeats 5 gromark lfsr
reverted
0/24
0 7 s unclocked 27 Simulator, round two: which constructions reproduce the width-21 repeats, the width-7 doublet column and the closeness together? 7 construction simulation
reverted
0/24
0 51 s 26 Two keyed columnar transpositions from the puzzle's words, then the tableau 6 transposition then tableau
reverted
0/24
0 4 min 25 Both autokeys again, with the tableau built from the puzzle's own words 1 keyed periodic
reverted
0/24
0 47 min 24 A key word plus the K2 coordinates: the digits as a numeric second component added to a repeating word 3 two component key
reverted
0/24
0 62 s 23 Masks that move the known letters: the message written backwards, or padded with nulls, before a periodic tableau 2 masked plaintext
reverted
0/24
0 2 min 22 Porta: the reciprocal half-alphabet tableau, which the 24 conventions never covered 1 keyed periodic
reverted
0/24
0 70 s 21 A running key from Howard Carter's book: the text K3 paraphrases, slid past K4 at every offset 1 keyed periodic
reverted
0/24
0 2 min 20 The short periods come back: a periodic tableau at periods 1 to 52 with alphabets mixed from the puzzle's words 1 keyed periodic
reverted
0/24
0 26 min 19 Substitution first, a route last: do the 24 crib images stay one letter to one letter under any route? 9 substitution then transposition
reverted
0/24
0 3 min 18 Construction simulator: which cipher families produce texts with K4's statistical fingerprint? 7 construction simulation
reverted
0/24
0 15 min 17 A running key read off the sculpture: the carved tableau, the Morse, and the whole right-hand panel 1 keyed periodic
reverted
0/24
0 59 s 16 Every route from 0006 and 0008, then the tableau: does any route make the forced key read as English? 6 transposition then tableau
reverted
0/24
0 3 min 15 Hill ciphers 2x2, 3x3 and 4x4 solved straight from the crib blocks, with and without an added vector 8 hill polygraphic
reverted
35.6%
16/24
2 3 min 14 Two key words, two passes through the tableau: the cribs as linear equations mod 26 3 two component key
reverted
0/24
0 3 min 13 Gromark and its cousins: must the 13 known shifts in a row obey a lagged-Fibonacci rule? 5 gromark lfsr
reverted
0/24
0 89 s Pivot P2: 1 keyed periodic → 5 Gromark 12 Plaintext autokey, chained: the 24 known letters force the rest, lag by lag 1 keyed periodic
reverted
0/24
0 2 min 11 A progressive key: the key word steps forward on every repeat, which revives the short periods 1 keyed periodic
reverted
0/24
0 6 min 10 The same two forced key stretches, with the tableau's alphabets mixed from the puzzle's own words 1 keyed periodic
reverted
0/24
0 4 min 9 Do the two crib runs force a readable key, with the copper exact or off by one letter? 1 keyed periodic
reverted
0/24
0 2 min 8 K3's own matrix run through all the possible shifts, then the tableau 6 transposition then tableau
reverted
0/24
0 2 min 7 The keyed tableau first, a matrix transposition last: the order the NSA guessed in 1992 6 transposition then tableau
reverted
0/24
0 54 s unclocked 6 A matrix transposition first, the keyed tableau last: which routes let the 24 cribs force a short periodic key 6 transposition then tableau
reverted
0/24
0 4 min Pivot P1: 1 keyed periodic → 6 transposition then tableau 5 Periodic keyed tableau with separate alphabets: which periods survive, and what key they force 1 keyed periodic
reverted
0/24
0 0 s unclocked 4 A running key drawn from K1, K2 or K3 at every offset 1 keyed periodic
reverted
0/24
0 1 s unclocked 3 Plaintext autokey, decided where two known letters line up 1 keyed periodic
reverted
0/24
0 0 s unclocked 2 Ciphertext autokey is decided by the cribs at every lag and convention 1 keyed periodic
reverted
0/24
0 0 s unclocked 1 Baseline: keyed Vigenere over the sculpture's own alphabet with key KRYPTOS 1 keyed periodic
reverted
93.6%
2/24
1 0 s none