MysteryTwister C3
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With the launch of MysteryTwister C3 you can challenge your own knowledge by solving the given cryptographic challenges.


Welcome to MTC3 — The Cipher Contest

mtc3

You like riddles? You always loved to solve the crosswords in your newspaper? Or maybe you are just curious and want to find out about some of the ways to hide a secret (and possibily even to uncover it)? This is your place! Here at MysteryTwister C3 you can solve crypto challenges, starting from the simple Caesar cipher all the way to modern AES we have challenges for everyone. Our challenges range from level I to III, and an additional level X for "mystery" challenges (they may have been unsolved for a long time, mostly we don't know their solution or have no idea whether there is a solution at all). If you are a beginner its probably best if you start trying those challenges that have been solved mostly (see table below). Additional information regarding MTC3 can be found on our about page.


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You might want to try some of these

The following table provides you with the list of all challenges currently available. If you are logged in, those are excluded which you already solved or where you are a (co-)author.
The challenges are sorted by default by the ones which have been solved mostly by all users. Alternatively you can also sort the table by content of column [to do this just click on the head of one of the columns "Challenge name", "Level", "# times solved" or "Current points to get"].
"Current points to get" shows how many points you get when you submit the solution today. By clicking on the challenge name within the list you will be taken directly to the corresponding challenge and can start solving it.
Score hunters try those challenges that yield the highest available points. Accordingly, those will be harder! Test your skills! Besides using the table below there is also a detailed list of all challenges



Check, which levels to show Level I Level II Level III Level X
If you are logged-in this list will only show those challenges you haven't solved yet.

# challenge name Level # times solved Current points to get
1 Number Sequence I 3864 100
2 Original Caesar Cipher I 2649 100
3 Number Sequence — Part 2 I 1860 100
4 Caesar Encryption I 1273 100
5 Beaver Code I 1044 100
6 Letter to the Templars — Part 1 I 911 100
7 Number Sequence — Part 3 I 872 100
8 Letter to the Templars — Part 2 I 730 100
9 A hidden word I 720 100
10 Number Sequence — Part 4 I 718 100
11 Letter to the Templars — Part 3 II 617 1088
12 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 510 100
13 Monoalphabetic Substitution I 510 100
14 Cracking SHA1-Hashed Passwords II 455 1084
15 Factorization Cipher — Part 1 I 448 100
16 Grille Cipher I 419 100
17 A modified homophonic cipher with reduced alphabets — Part 1 I 362 100
18 Advent-Challenge — Part 1 I 342 100
19 A modified homophonic cipher with reduced alphabets — Part 2 I 311 100
20 Number Sequence — Part 8 I 304 100
21 One-Time Pad with Flaws I 281 100
22 Alice's Birthday Party (Part 1) II 266 1083
23 Snow White and the seven dwarfs I 264 100
24 Alice's Birthday Party (Part 2) II 255 1083
25 From Russia with Love I 252 100
26 Broadcasting and low exponent — RSA-Attack II 203 1085
27 Modified Caesar Cipher I 201 100
28 How do you become a big cryptographer? I 200 100
29 M-138 — Part 1 I 180 100
30 Reserve Hand Procedure — Part 1 I 180 100
31 Not-so-Secret Message from Malawi — Part I (RSA) II 174 1083
32 Brute-Force-Attack on Triple-DES with Reduced Key Space II 168 1083
33 Letter from the Alleged Countess Julie von Ortenburg I 164 100
34 Classical Ciphers^3 I 160 100
35 Enigma Messages with Repeated Letters — Part 1 I 158 100
36 Nils away on travel I 149 100
37 Hybrid Encryption I II 148 1083
38 RSA: Two different keys — same ciphertext II 145 1085
39 Pigpen with a twist — Part 1 I 142 100
40 The Book Code: A Challenge for Bookworms I 134 100
41 Molehunt (Part 1/3) I 134 100
42 Factorization Cipher — Part 2 II 133 1086
43 ¿No Hablas Español? No problemo! I 133 100
44 Molehunt (Part 2/3) I 129 100
45 Enigma Part 1 II 120 1083
46 Number Sequence — Part 6 I 118 100
47 Autokey Cipher I 117 100
48 A Secret Message from Castle Mansfeld I 116 100
49 Trifid Cipher I 112 100
50 M-138 — Part 2 II 111 1097
51 A really long number sequence II 110 1085
52 Cryptanalysis Hacking Puzzles — Part 2 I 110 100
53 ADFGVX — Part 2 I 108 100
54 Image Noise I 105 100
55 ADFGVX — Part 1 I 100 100
56 Playfair Encryption I 99 100
57 Kaskade-S/T — Part 1 I 99 100
58 Playfair with hints about the grid I 97 100
59 Enigma Combinatorics I 95 100
60 Double Columnar Transposition I 94 100
61 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 93 100
62 Number Sequence — Part 10 I 90 100
63 Heartbleed — Part 1 I 89 100
64 ECDH-Key Exchange for Beginners I 87 100
65 A hidden word — Part 2 I 85 100
66 Factorization Cipher — Part 3 II 84 1086
67 Zodiac Cipher I 82 100
68 Number Sequence — Part 9 I 80 100
69 ORYX Stream Cipher Part I II 79 1083
70 The Last Note I 79 100
71 Enigma Part 2 II 78 1083
72 Number Sequence — Part 5 I 78 100
73 Partial Key Exposure with RSA — Part 1 II 77 1087
74 Hill Cipher with Sudoku Key I 77 100
75 Enigma Messages with Repeated Letters — Part 3 I 72 100
76 Molehunt (Part 3/3) II 72 1083
77 Enigma Messages with Repeated Letters — Part 2 I 71 100
78 Enigma Messages I 69 100
79 Smartcard RSA II 69 1083
80 Enigma Messages with Repeated Letters — Part 5 I 69 100
81 Multilingual Monoalphabetic Substitution I 68 100
82 Number Sequence — Part 7 I 66 100
83 BCR code (Book-Caesar-RSA) II 66 1088
84 Cascading Encryption — Part 1/3 I 66 100
85 Enigma Messages with Repeated Letters — Part 4 I 63 100
86 Turing Bombe Enigma I I 62 100
87 Recycled One-Time Pad I 60 100
88 AES key — encoded in the machine readable zone of a European ePassport II 60 1086
89 Heartbleed — Part 2 I 60 100
90 Unusual encryption using a diophantine equation II 59 1085
91 Monoalphabetic substitution with camouflage — Part 1 I 56 100
92 An Invisible Message I 54 100
93 The Einstein Enigma II 50 1121
94 M-138 — Part 3 II 49 1097
95 Kaskade-S/T — Part 2 II 48 1084
96 ORYX Stream Cipher Part II II 47 1083
97 Modular Sequences I 46 100
98 RSA Factoring Challenge: RSA-704 II 46 0
99 Monoalphabetic substitution with camouflage — Part 2 II 45 1086
100 News from Castle Mansfeld I 45 100
101 Unconcealed RSA messages II 45 1086
102 New Year's Greetings — Part 1 I 45 100
103 Monoalphabetic substitution with camouflage — Part 4 I 44 100
104 Keyshanc — Part 1 II 44 1087
105 Monoalphabetic substitution with camouflage — Part 3 II 42 1086
106 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 42 1084
107 Weakened Granit — Part 1 I 42 100
108 New Year's Greetings — Part 2 I 42 100
109 Strange Message from Thessaloniki I 42 100
110 Summer Job II 40 1126
111 RSA Factoring Challenge: RSA-210 II 40 0
112 Music Code — Part 2 II 39 1085
113 CMEA 1 II 39 1084
114 Music Code — Part 1 I 39 100
115 Double Column Transposition — Part 4 II 39 1094
116 An 'unhearable' message I 39 100
117 New Year's Greetings — Part 3 I 39 100
118 Double Column Transposition — Part 2 II 38 1094
119 Pigpen with a twist — Part 2 II 37 1085
120 New Year's Greetings — Part 4 I 37 100
121 Ku Klux Klan X 36 var
122 Pigpen with a twist — Part 3 II 34 1085
123 Keyshanc — Part 2 II 34 1087
124 Not-so-Secret Message from Malawi — Part II (ECC) II 34 1083
125 Advent-Challenge — Part 2 II 34 1119
126 Double Column Transposition — Part 3 II 34 1094
127 Trendy Messenger II 31 1126
128 ORYX Stream Cipher — Part 3 (revised) II 30 1091
129 Heartbleed — Part 3 II 30 1095
130 Advent Challenge — Part 4 II 29 1119
131 Kaskade-S/T — Part 3 II 29 1084
132 Fastest in the West II 29 1126
133 Advent Challenge — Part 3 II 28 1119
134 Lattice Part 1 II 28 1084
135 Double Column Transposition — Part 1 II 27 1094
136 Homophonic Encryption — Part 1 II 27 1147
137 Monoalphabetic Substitution with Camouflage — Part 5 II 27 1087
138 Spanish Strip Cipher — Part 1 II 26 1094
139 CMEA 2 III 26 13101
140 Typex — Part 1 II 25 1090
141 Monoalphabetic Substitution with Nostradamus Flavor II 24 1140
142 RSA Factoring Challenge: RSA-220 II 24 0
143 Cryptanalysis Hacking Puzzles — Part 1 I 23 100
144 RSA with Special d III 22 13095
145 Homophonic Encryption — Part 2 II 22 1147
146 Typex — Part 2 II 22 1090
147 Spanish Strip Cipher — Part 2 II 22 1094
148 Homophonic Encryption — Part 3 II 21 1147
149 Polyhomophonic Substitution — Part 1 I 20 101
150 RSA Factoring Challenge: RSA-230 II 20 0
151 Homophonic Encryption — Part 4 II 20 1147
152 Lightweight Introduction to Lattices — Part 1 I 19 101
153 Handycipher made in love — Part 1 II 19 1140
154 Breaking a Filter Generator II 17 1131
155 M-138 — Part 4 II 17 1097
156 AES ECB Wrong Encoding II 17 1119
157 The LoRa Cipher: Logic Randomness — Part 1 II 16 1195
158 Concealed Messages — Vigenère's Night Sky X 16 var
159 Weakened Handycipher — Part 1 II 15 1099
160 New Year's Greetings — Part 5 II 15 1104
161 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 15 1106
162 Purple 1 II 15 1083
163 Lightweight Introduction to Lattices — Part 3 II 15 1344
164 A Cloaked Substitution Cipher — Part 1 II 15 1158
165 Sigaba Part 1 II 14 1083
166 A Cloaked Substitution Cipher — Part 2 II 14 1159
167 Handycipher made in love — Part 2 II 14 1148
168 Weakened Handycipher — Part 3 II 14 1099
169 Polyphonic Substitution Cipher — Part 1 II 14 1172
170 Cipher ID — Part 1 II 13 1172
171 Flawed Usage of a OTP Cipher by the BND II 13 1100
172 Polyhomophonic Substitution — Part 2 II 13 1210
173 Weakened Handycipher — Part 2 II 13 1099
174 Cascading Encryption — Part 2/3 II 13 1090
175 Cascading Encryption — Part 3/3 II 12 1090
176 Lightweight Introduction to Lattices — Part 2 I 12 102
177 The T52 Sturgeon Challenge — Part 1 II 12 1154
178 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 11 1084
179 The T52 Sturgeon Challenge — Part 2 II 11 1155
180 ORYX Stream Cipher — Part 4a II 11 1094
181 Polyphonic Substitution Cipher — Part 2 II 11 1185
182 Polyhomophonic Substitution — Part 3 II 10 1214
183 Akelarre Part 1 II 10 1083
184 Kaskade-S/T — Part 5 II 10 1085
185 The T52 Sturgeon Challenge — Part 3 II 9 1155
186 RSA Factoring Challenge: RSA-240 III 9 0
187 Hilly — Part 1 II 8 1110
188 Double Column Transposition — Part 5 II 8 1095
189 The T52 Sturgeon Challenge — Part 4 II 8 1155
190 Handycipher — Part 2 II 7 1098
191 RSA Factoring Challenge: RSA-250 III 7 0
192 The SZ42 Challenge — Part 1 II 6 1378
193 Handycipher — Part 3 III 6 13346
194 RSA Factoring Challenge: RSA-232 III 6 0
195 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 6 1114
196 Holographic Encryption — Part 1 II 6 1112
197 Weakened Handycipher — Part 6 II 5 1106
198 The SZ42 Challenge — Part 2 II 5 1547
199 Handycipher — Part 5 III 5 13473
200 Handycipher — Part 6 III 5 13473
201 Weakened Handycipher — Part 4 II 5 1106
202 Weakened Handycipher — Part 5 II 5 1106
203 Handycipher — Part 1 II 5 1098
204 The T52 Sturgeon Challenge — Part 8 II 5 1157
205 The T52 Sturgeon Challenge — Part 12 II 5 1157
206 The T52 Sturgeon Challenge — Part 11 II 5 1157
207 "The Road" — Part 1 II 5 1136
208 The T52 Sturgeon Challenge — Part 7 II 5 1157
209 The SIGABA Challenge — Part 2 II 5 1200
210 The SIGABA Challenge — Part 1 II 5 1198
211 The T52 Sturgeon Challenge — Part 9 II 4 1157
212 The T52 Sturgeon Challenge — Part 5 II 4 1157
213 The T52 Sturgeon Challenge — Part 6 II 4 1157
214 The SIGABA Challenge — Part 3 III 4 14785
215 The T52 Sturgeon Challenge — Part 10 II 4 1157
216 Handycipher — Part 4 III 4 13473
217 Spirale — Part 1 II 4 1100
218 Notes of an Italian Soldier X 4 var
219 Spirale — Part 2 II 4 1100
220 Handycipher — Part 8 III 3 13543
221 Extended Handycipher — Part 2 II 3 1098
222 Extended Handycipher — Part 1 II 3 1098
223 Sigaba Part 2 III 3 13095
224 Handycipher — Part 9 III 3 13543
225 Christmas Challenge 2019: Differential Cryptanalysis — Part 1 II 3 1179
226 The Heavy T52 Sturgeon Challenge — Part 4 III 3 14964
227 Holographic Encryption — Part 2 II 3 1112
228 Extended Handycipher — Part 3 II 3 1098
229 Differential Cryptanalysis — Part 2 II 3 1188
230 The Vatican Challenge — Part 1 X 3 var
231 Extended Handycipher — Part 4 III 3 13473
232 The SIGABA Challenge — Part 4 III 3 14813
233 Extended Handycipher — Part 5 III 3 13473
234 Weakened ElsieFour — Part 1 II 3 1124
235 The Vatican Challenge — Part 2 X 3 var
236 Spirale — Part 3 II 3 1100
237 Double Column Transposition X 2 var
238 ORYX Stream Cipher — Part 4b III 2 13280
239 Weakened ElsieFour — Part 3 II 2 1117
240 Catherine of Aragon's Letter to King Ferdinand, her Father (1509) X 2 var
241 The SIGABA Challenge — Part 5 III 2 14852
242 ElsieFour — Part 1 III 2 13650
243 Handycipher — Part 7 III 2 13543
244 Unknown Author X 2 var
245 Extended Handycipher — Part 6 III 2 13473
246 Hilly — Part 2 II 1 1117
247 The Heavy T52 Sturgeon Challenge — Part 5 III 1 15002
248 Beale Ciphers X 1 var
249 The Heavy T52 Sturgeon Challenge — Part 1 III 1 14310
250 Substitution Cipher with Non-Prefix Codes III 1 13124
251 The Heavy T52 Sturgeon Challenge — Part 9 III 1 15064
252 Handycipher — Part 10 II 1 1152
253 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1088
254 The Heavy T52 Sturgeon Challenge — Part 7 III 1 15015
255 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1106
256 The Vatican Challenge — Part 4 X 1 var
257 The Heavy T52 Sturgeon Challenge — Part 3 III 0 14363
258 RSA Factoring Challenge: RSA-340 III 0 13154
259 RSA Factoring Challenge: RSA-350 III 0 13154
260 RSA Factoring Challenge: RSA-370 III 0 13154
261 RSA Factoring Challenge: RSA-380 III 0 13154
262 RSA Factoring Challenge: RSA-390 III 0 13154
263 RSA Factoring Challenge: RSA-400 III 0 13154
264 The Heavy T52 Sturgeon Challenge — Part 2 III 0 14326
265 RSA Factoring Challenge: RSA-360 III 0 13154
266 RSA Factoring Challenge: RSA-460 III 0 13154
267 RSA Factoring Challenge: RSA-470 III 0 13154
268 The Heavy T52 Sturgeon Challenge — Part 8 III 0 15029
269 The Heavy T52 Sturgeon Challenge — Part 6 III 0 15015
270 RSA Factoring Challenge: RSA-480 III 0 13154
271 RSA Factoring Challenge: RSA-2048 III 0 13154
272 RSA Factoring Challenge: RSA-500 III 0 13154
273 RSA Factoring Challenge: RSA-617 III 0 13154
274 RSA Factoring Challenge: RSA-1536 III 0 13154
275 The SIGABA Challenge — Part 6 III 0 14911
276 RSA Factoring Challenge: RSA-420 III 0 13154
277 World Record Challenge: Break 65 Bits of AES III 0 13095
278 RSA Factoring Challenge: RSA-430 III 0 13154
279 RSA Factoring Challenge: RSA-440 III 0 13154
280 Kryptos X 0 var
281 RSA Factoring Challenge: RSA-450 III 0 13154
282 RSA Factoring Challenge: RSA-410 III 0 13154
283 Double Column Transposition Reloaded — Part 2 III 0 13257
284 Twelve-Year-Old Murder Case X 0 var
285 Double-Column Transposition/Granit — Part 1 II 0 1099
286 Double-Column Transposition/Granit — Part 2 II 0 1099
287 The third ENIGMA M4 message X 0 var
288 RSA Factoring Challenge: RSA-260 III 0 13154
289 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13105
290 Weakened ElsieFour — Part 2 II 0 1124
291 Dorabella X 0 var
292 Double-Column Transposition/Granit — Part 3 II 0 1099
293 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1106
294 Weakened Granit — Part 3 II 0 1101
295 RSA Factoring Challenge: RSA-490 III 0 13154
296 Digital Signatures: DSA with Medium Fields III 0 13133
297 Weakened Granit — Part 2 II 0 1101
298 D'Agapeyeff X 0 var
299 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1106
300 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1106
301 Spirale — Part 4 III 0 13387
302 RSA Factoring Challenge: RSA-270 III 0 13154
303 RSA Factoring Challenge: RSA-896 III 0 13154
304 RSA Factoring Challenge: RSA-1024 III 0 13154
305 RSA Factoring Challenge: RSA-309 III 0 13154
306 Double Column Transposition Reloaded — Part 1 III 0 13257
307 The Vatican Challenge — Part 3 X 0 var
308 The Vatican Challenge — Part 5 X 0 var
309 RSA Factoring Challenge: RSA-330 III 0 13154
310 RSA Factoring Challenge: RSA-320 III 0 13154
311 RSA Factoring Challenge: RSA-310 III 0 13154
312 Kaskade-S/T — Part 4 II 0 1085
313 Double Column Transposition Reloaded — Part 3 III 0 13257
314 RSA Factoring Challenge: RSA-280 III 0 13154
315 Spanish Strip Cipher — Part 3 X 0 var
316 ORYX Stream Cipher — Part 4c III 0 13280
317 RSA Factoring Challenge: RSA-290 III 0 13154
318 "The Road" — Part 2 II 0 1136
319 RSA Factoring Challenge: RSA-300 III 0 13154
320 "The Road" — Part 3 II 0 1136
321 ORYX Stream Cipher — Part 4d III 0 13229
 
 
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   +++    [00:16 - 12.08.2020] Polaris solved the Level I challenge 'Image Noise'    +++    [00:10 - 12.08.2020] Polaris solved the Level I challenge 'From Russia with Love'    +++    [16:38 - 11.08.2020] kshepherd solved the Level I challenge 'Snow White and the seven dwarfs'    +++    [03:02 - 11.08.2020] noother solved the Level III challenge 'RSA Factoring Challenge: RSA-250'    +++    [02:53 - 11.08.2020] noother solved the Level II challenge 'RSA Factoring Challenge: RSA-210'    +++