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 3759 100
2 Original Caesar Cipher I 2576 100
3 Number Sequence — Part 2 I 1808 100
4 Caesar Encryption I 1253 100
5 Beaver Code I 1019 100
6 Letter to the Templars — Part 1 I 890 100
7 Number Sequence — Part 3 I 848 100
8 Letter to the Templars — Part 2 I 712 100
9 A hidden word I 706 100
10 Number Sequence — Part 4 I 701 100
11 Letter to the Templars — Part 3 II 596 1090
12 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 499 100
13 Monoalphabetic Substitution I 479 100
14 Cracking SHA1-Hashed Passwords II 447 1085
15 Factorization Cipher — Part 1 I 439 100
16 Grille Cipher I 408 100
17 A modified homophonic cipher with reduced alphabets — Part 1 I 357 100
18 Advent-Challenge — Part 1 I 329 100
19 A modified homophonic cipher with reduced alphabets — Part 2 I 307 100
20 Number Sequence — Part 8 I 292 100
21 One-Time Pad with Flaws I 276 100
22 Alice's Birthday Party (Part 1) II 260 1084
23 Snow White and the seven dwarfs I 259 100
24 Alice's Birthday Party (Part 2) II 249 1084
25 From Russia with Love I 242 100
26 Broadcasting and low exponent — RSA-Attack II 197 1086
27 Modified Caesar Cipher I 196 100
28 How do you become a big cryptographer? I 196 100
29 Reserve Hand Procedure — Part 1 I 176 100
30 M-138 — Part 1 I 173 100
31 Not-so-Secret Message from Malawi — Part I (RSA) II 170 1084
32 Brute-Force-Attack on Triple-DES with Reduced Key Space II 164 1084
33 Letter from the Alleged Countess Julie von Ortenburg I 163 100
34 Classical Ciphers^3 I 160 100
35 Enigma Messages with Repeated Letters — Part 1 I 157 100
36 Nils away on travel I 148 100
37 Hybrid Encryption I II 147 1084
38 RSA: Two different keys — same ciphertext II 143 1086
39 Pigpen with a twist — Part 1 I 140 100
40 The Book Code: A Challenge for Bookworms I 132 100
41 ¿No Hablas Español? No problemo! I 130 100
42 Factorization Cipher — Part 2 II 130 1087
43 Molehunt (Part 1/3) I 128 100
44 Molehunt (Part 2/3) I 127 100
45 Enigma Part 1 II 119 1084
46 A Secret Message from Castle Mansfeld I 115 100
47 Number Sequence — Part 6 I 113 100
48 Autokey Cipher I 112 100
49 Trifid Cipher I 110 100
50 M-138 — Part 2 II 109 1099
51 A really long number sequence II 109 1086
52 ADFGVX — Part 2 I 107 100
53 Image Noise I 103 100
54 Cryptanalysis Hacking Puzzles — Part 2 I 102 100
55 Kaskade-S/T — Part 1 I 99 100
56 ADFGVX — Part 1 I 98 100
57 Playfair Encryption I 95 100
58 Enigma Combinatorics I 94 100
59 Double Columnar Transposition I 93 100
60 Playfair with hints about the grid I 92 100
61 Heartbleed — Part 1 I 89 100
62 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 88 100
63 ECDH-Key Exchange for Beginners I 86 100
64 Number Sequence — Part 10 I 84 100
65 A hidden word — Part 2 I 83 100
66 Factorization Cipher — Part 3 II 82 1087
67 Zodiac Cipher I 79 100
68 The Last Note I 79 100
69 Enigma Part 2 II 78 1084
70 ORYX Stream Cipher Part I II 78 1084
71 Number Sequence — Part 9 I 77 100
72 Number Sequence — Part 5 I 77 100
73 Partial Key Exposure with RSA — Part 1 II 75 1088
74 Hill Cipher with Sudoku Key I 74 100
75 Molehunt (Part 3/3) II 72 1084
76 Enigma Messages with Repeated Letters — Part 3 I 72 100
77 Enigma Messages with Repeated Letters — Part 2 I 71 100
78 Enigma Messages I 69 100
79 Enigma Messages with Repeated Letters — Part 5 I 69 100
80 Multilingual Monoalphabetic Substitution I 68 100
81 Smartcard RSA II 66 1084
82 Cascading Encryption — Part 1/3 I 66 100
83 BCR code (Book-Caesar-RSA) II 65 1089
84 Number Sequence — Part 7 I 64 100
85 Enigma Messages with Repeated Letters — Part 4 I 63 100
86 Turing Bombe Enigma I I 62 100
87 Heartbleed — Part 2 I 60 100
88 AES key — encoded in the machine readable zone of a European ePassport II 60 1087
89 Unusual encryption using a diophantine equation II 58 1086
90 Recycled One-Time Pad I 58 100
91 Monoalphabetic substitution with camouflage — Part 1 I 56 100
92 An Invisible Message I 54 100
93 The Einstein Enigma II 50 1127
94 M-138 — Part 3 II 48 1099
95 Kaskade-S/T — Part 2 II 48 1085
96 ORYX Stream Cipher Part II II 47 1084
97 Monoalphabetic substitution with camouflage — Part 2 II 45 1087
98 New Year's Greetings — Part 1 I 45 100
99 News from Castle Mansfeld I 45 100
100 Unconcealed RSA messages II 44 1087
101 Modular Sequences I 44 100
102 Keyshanc — Part 1 II 44 1088
103 RSA Factoring Challenge: RSA-704 II 43 0
104 Monoalphabetic substitution with camouflage — Part 4 I 43 100
105 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 42 1085
106 Strange Message from Thessaloniki I 42 100
107 New Year's Greetings — Part 2 I 42 100
108 Monoalphabetic substitution with camouflage — Part 3 II 41 1087
109 New Year's Greetings — Part 3 I 39 100
110 Weakened Granit — Part 1 I 39 100
111 CMEA 1 II 39 1084
112 An 'unhearable' message I 38 100
113 Music Code — Part 2 II 38 1086
114 Music Code — Part 1 I 38 100
115 New Year's Greetings — Part 4 I 37 100
116 Summer Job II 37 1133
117 Double Column Transposition — Part 4 II 37 1096
118 Double Column Transposition — Part 2 II 37 1096
119 Pigpen with a twist — Part 2 II 37 1086
120 RSA Factoring Challenge: RSA-210 II 36 0
121 Ku Klux Klan X 35 var
122 Not-so-Secret Message from Malawi — Part II (ECC) II 34 1084
123 Keyshanc — Part 2 II 34 1088
124 Pigpen with a twist — Part 3 II 34 1086
125 Double Column Transposition — Part 3 II 33 1096
126 Advent-Challenge — Part 2 II 33 1124
127 Heartbleed — Part 3 II 30 1097
128 ORYX Stream Cipher — Part 3 (revised) II 30 1092
129 Advent Challenge — Part 4 II 29 1124
130 Kaskade-S/T — Part 3 II 29 1085
131 Trendy Messenger II 28 1133
132 Advent Challenge — Part 3 II 28 1124
133 Fastest in the West II 28 1133
134 Monoalphabetic Substitution with Camouflage — Part 5 II 26 1088
135 Double Column Transposition — Part 1 II 26 1095
136 Homophonic Encryption — Part 1 II 26 1162
137 CMEA 2 III 26 13116
138 Spanish Strip Cipher — Part 1 II 25 1095
139 Lattice Part 1 II 24 1085
140 RSA with Special d III 22 13110
141 Typex — Part 1 II 22 1091
142 Homophonic Encryption — Part 2 II 22 1162
143 Monoalphabetic Substitution with Nostradamus Flavor II 22 1152
144 Cryptanalysis Hacking Puzzles — Part 1 I 22 100
145 RSA Factoring Challenge: RSA-220 II 22 0
146 Spanish Strip Cipher — Part 2 II 21 1095
147 Homophonic Encryption — Part 3 II 21 1162
148 Typex — Part 2 II 20 1091
149 Homophonic Encryption — Part 4 II 19 1162
150 RSA Factoring Challenge: RSA-230 II 18 0
151 Handycipher made in love — Part 1 II 18 1152
152 M-138 — Part 4 II 16 1099
153 Breaking a Filter Generator II 16 1140
154 Concealed Messages — Vigenère's Night Sky X 16 var
155 AES ECB Wrong Encoding II 16 1124
156 New Year's Greetings — Part 5 II 15 1106
157 Weakened Handycipher — Part 1 II 15 1101
158 Purple 1 II 15 1084
159 A Cloaked Substitution Cipher — Part 1 II 15 1181
160 Weakened Handycipher — Part 3 II 14 1101
161 The LoRa Cipher: Logic Randomness — Part 1 II 14 1302
162 Polyphonic Substitution Cipher — Part 1 II 14 1212
163 A Cloaked Substitution Cipher — Part 2 II 14 1182
164 Polyhomophonic Substitution — Part 1 I 14 109
165 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 14 1108
166 Sigaba Part 1 II 13 1084
167 Handycipher made in love — Part 2 II 13 1164
168 Flawed Usage of a OTP Cipher by the BND II 13 1102
169 Weakened Handycipher — Part 2 II 13 1101
170 Cipher ID — Part 1 II 12 1211
171 Cascading Encryption — Part 2/3 II 11 1091
172 Cascading Encryption — Part 3/3 II 11 1091
173 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 11 1085
174 ORYX Stream Cipher — Part 4a II 11 1095
175 Polyphonic Substitution Cipher — Part 2 II 10 1249
176 Kaskade-S/T — Part 5 II 10 1085
177 The T52 Sturgeon Challenge — Part 1 II 10 1173
178 Polyhomophonic Substitution — Part 2 II 10 1660
179 The T52 Sturgeon Challenge — Part 2 II 9 1175
180 Akelarre Part 1 II 9 1084
181 Hilly — Part 1 II 8 1113
182 The T52 Sturgeon Challenge — Part 3 II 8 1175
183 Double Column Transposition — Part 5 II 8 1096
184 The T52 Sturgeon Challenge — Part 4 II 7 1175
185 Handycipher — Part 2 II 7 1100
186 Holographic Encryption — Part 1 II 6 1115
187 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 6 1118
188 RSA Factoring Challenge: RSA-240 III 6 0
189 Handycipher — Part 3 III 6 13377
190 The SIGABA Challenge — Part 1 II 5 1330
191 "The Road" — Part 1 II 5 1145
192 Weakened Handycipher — Part 6 II 5 1108
193 Handycipher — Part 6 III 5 13517
194 The SIGABA Challenge — Part 2 II 5 1349
195 Handycipher — Part 5 III 5 13517
196 Handycipher — Part 1 II 5 1100
197 Weakened Handycipher — Part 5 II 5 1108
198 Weakened Handycipher — Part 4 II 5 1108
199 Handycipher — Part 4 III 4 13517
200 Spirale — Part 1 II 4 1102
201 Spirale — Part 2 II 4 1102
202 The T52 Sturgeon Challenge — Part 8 II 4 1179
203 Notes of an Italian Soldier X 4 var
204 The SIGABA Challenge — Part 3 III 4 16485
205 The T52 Sturgeon Challenge — Part 11 II 4 1179
206 The T52 Sturgeon Challenge — Part 12 II 4 1179
207 Extended Handycipher — Part 4 III 3 13517
208 The Vatican Challenge — Part 2 X 3 var
209 Extended Handycipher — Part 5 III 3 13517
210 The Vatican Challenge — Part 1 X 3 var
211 Differential Cryptanalysis — Part 2 II 3 1265
212 The T52 Sturgeon Challenge — Part 5 II 3 1179
213 The T52 Sturgeon Challenge — Part 6 II 3 1179
214 RSA Factoring Challenge: RSA-232 III 3 0
215 Handycipher — Part 9 III 3 13596
216 The T52 Sturgeon Challenge — Part 10 II 3 1179
217 Holographic Encryption — Part 2 II 3 1115
218 The T52 Sturgeon Challenge — Part 9 II 3 1179
219 Christmas Challenge 2019: Differential Cryptanalysis — Part 1 II 3 1230
220 The T52 Sturgeon Challenge — Part 7 II 3 1179
221 Handycipher — Part 8 III 3 13596
222 RSA Factoring Challenge: RSA-250 III 3 0
223 Spirale — Part 3 II 3 1102
224 Sigaba Part 2 III 3 13110
225 Extended Handycipher — Part 3 II 3 1100
226 Extended Handycipher — Part 1 II 3 1100
227 Extended Handycipher — Part 2 II 3 1100
228 ElsieFour — Part 1 III 2 13718
229 Handycipher — Part 7 III 2 13596
230 Weakened ElsieFour — Part 3 II 2 1121
231 Double Column Transposition X 2 var
232 Unknown Author X 2 var
233 The SIGABA Challenge — Part 4 III 2 16839
234 ORYX Stream Cipher — Part 4b III 2 13306
235 Weakened ElsieFour — Part 1 II 2 1130
236 The SIGABA Challenge — Part 5 III 2 17893
237 Extended Handycipher — Part 6 III 2 13517
238 Catherine of Aragon's Letter to King Ferdinand, her Father (1509) X 2 var
239 The Vatican Challenge — Part 4 X 1 var
240 Beale Ciphers X 1 var
241 Hilly — Part 2 II 1 1122
242 Substitution Cipher with Non-Prefix Codes III 1 13140
243 Handycipher — Part 10 II 1 1170
244 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1108
245 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1089
246 The Heavy T52 Sturgeon Challenge — Part 3 III 0 14767
247 The Vatican Challenge — Part 3 X 0 var
248 "The Road" — Part 2 II 0 1145
249 Weakened ElsieFour — Part 2 II 0 1130
250 "The Road" — Part 3 II 0 1145
251 The Vatican Challenge — Part 5 X 0 var
252 The Heavy T52 Sturgeon Challenge — Part 1 III 0 14662
253 The Heavy T52 Sturgeon Challenge — Part 2 III 0 14696
254 Double Column Transposition Reloaded — Part 3 III 0 13281
255 RSA Factoring Challenge: RSA-340 III 0 13172
256 RSA Factoring Challenge: RSA-350 III 0 13172
257 RSA Factoring Challenge: RSA-330 III 0 13172
258 RSA Factoring Challenge: RSA-320 III 0 13172
259 RSA Factoring Challenge: RSA-310 III 0 13172
260 RSA Factoring Challenge: RSA-360 III 0 13172
261 RSA Factoring Challenge: RSA-370 III 0 13172
262 RSA Factoring Challenge: RSA-410 III 0 13172
263 RSA Factoring Challenge: RSA-420 III 0 13172
264 RSA Factoring Challenge: RSA-400 III 0 13172
265 RSA Factoring Challenge: RSA-390 III 0 13172
266 RSA Factoring Challenge: RSA-380 III 0 13172
267 RSA Factoring Challenge: RSA-1024 III 0 13172
268 RSA Factoring Challenge: RSA-309 III 0 13172
269 Kaskade-S/T — Part 4 II 0 1085
270 Digital Signatures: DSA with Medium Fields III 0 13151
271 Twelve-Year-Old Murder Case X 0 var
272 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13121
273 World Record Challenge: Break 65 Bits of AES III 0 13110
274 The third ENIGMA M4 message X 0 var
275 RSA Factoring Challenge: RSA-260 III 0 13172
276 RSA Factoring Challenge: RSA-290 III 0 13172
277 RSA Factoring Challenge: RSA-300 III 0 13172
278 RSA Factoring Challenge: RSA-280 III 0 13172
279 RSA Factoring Challenge: RSA-896 III 0 13172
280 RSA Factoring Challenge: RSA-270 III 0 13172
281 RSA Factoring Challenge: RSA-430 III 0 13172
282 RSA Factoring Challenge: RSA-440 III 0 13172
283 ORYX Stream Cipher — Part 4c III 0 13306
284 Double-Column Transposition/Granit — Part 1 II 0 1101
285 Spanish Strip Cipher — Part 3 X 0 var
286 Double Column Transposition Reloaded — Part 2 III 0 13281
287 Double Column Transposition Reloaded — Part 1 III 0 13281
288 Double-Column Transposition/Granit — Part 2 II 0 1101
289 Double-Column Transposition/Granit — Part 3 II 0 1101
290 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1108
291 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1108
292 Weakened Granit — Part 3 II 0 1103
293 Weakened Granit — Part 2 II 0 1103
294 Spirale — Part 4 III 0 13422
295 ORYX Stream Cipher — Part 4d III 0 13251
296 D'Agapeyeff X 0 var
297 RSA Factoring Challenge: RSA-470 III 0 13172
298 RSA Factoring Challenge: RSA-480 III 0 13172
299 RSA Factoring Challenge: RSA-1536 III 0 13172
300 RSA Factoring Challenge: RSA-460 III 0 13172
301 RSA Factoring Challenge: RSA-450 III 0 13172
302 RSA Factoring Challenge: RSA-490 III 0 13172
303 RSA Factoring Challenge: RSA-500 III 0 13172
304 Dorabella X 0 var
305 Kryptos X 0 var
306 RSA Factoring Challenge: RSA-2048 III 0 13172
307 RSA Factoring Challenge: RSA-617 III 0 13172
308 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1108
 
 
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   +++    [23:57 - 31.03.2020] lösbär solved the Level I challenge 'Number Sequence — Part 9'    +++    [23:39 - 31.03.2020] lösbär solved the Level I challenge 'Number Sequence — Part 6'    +++    [23:23 - 31.03.2020] ace2 solved the Level I challenge 'Cascading Encryption — Part 1/3'    +++    [18:24 - 31.03.2020] Rossignol solved the Level II challenge 'Homophonic Encryption — Part 4'    +++    [17:40 - 31.03.2020] lösbär solved the Level I challenge 'A hidden word — Part 2'    +++