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 3808 100
2 Original Caesar Cipher I 2613 100
3 Number Sequence — Part 2 I 1835 100
4 Caesar Encryption I 1264 100
5 Beaver Code I 1033 100
6 Letter to the Templars — Part 1 I 900 100
7 Number Sequence — Part 3 I 860 100
8 Letter to the Templars — Part 2 I 720 100
9 A hidden word I 717 100
10 Number Sequence — Part 4 I 712 100
11 Letter to the Templars — Part 3 II 606 1089
12 Monoalphabetic Substitution I 506 100
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 505 100
14 Cracking SHA1-Hashed Passwords II 451 1085
15 Factorization Cipher — Part 1 I 443 100
16 Grille Cipher I 414 100
17 A modified homophonic cipher with reduced alphabets — Part 1 I 359 100
18 Advent-Challenge — Part 1 I 334 100
19 A modified homophonic cipher with reduced alphabets — Part 2 I 309 100
20 Number Sequence — Part 8 I 299 100
21 One-Time Pad with Flaws I 278 100
22 Alice's Birthday Party (Part 1) II 263 1084
23 Snow White and the seven dwarfs I 261 100
24 Alice's Birthday Party (Part 2) II 252 1084
25 From Russia with Love I 245 100
26 Broadcasting and low exponent — RSA-Attack II 201 1086
27 How do you become a big cryptographer? I 199 100
28 Modified Caesar Cipher I 199 100
29 Reserve Hand Procedure — Part 1 I 178 100
30 M-138 — Part 1 I 177 100
31 Not-so-Secret Message from Malawi — Part I (RSA) II 171 1084
32 Brute-Force-Attack on Triple-DES with Reduced Key Space II 165 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 Molehunt (Part 1/3) I 132 100
42 ¿No Hablas Español? No problemo! I 131 100
43 Factorization Cipher — Part 2 II 131 1087
44 Molehunt (Part 2/3) I 127 100
45 Enigma Part 1 II 119 1084
46 A Secret Message from Castle Mansfeld I 116 100
47 Number Sequence — Part 6 I 116 100
48 Autokey Cipher I 113 100
49 Trifid Cipher I 110 100
50 A really long number sequence II 109 1086
51 M-138 — Part 2 II 109 1098
52 ADFGVX — Part 2 I 108 100
53 Image Noise I 103 100
54 Cryptanalysis Hacking Puzzles — Part 2 I 103 100
55 Kaskade-S/T — Part 1 I 99 100
56 ADFGVX — Part 1 I 99 100
57 Playfair Encryption I 97 100
58 Enigma Combinatorics I 94 100
59 Double Columnar Transposition I 94 100
60 Playfair with hints about the grid I 94 100
61 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 91 100
62 Heartbleed — Part 1 I 89 100
63 ECDH-Key Exchange for Beginners I 86 100
64 Number Sequence — Part 10 I 86 100
65 A hidden word — Part 2 I 85 100
66 Factorization Cipher — Part 3 II 83 1087
67 Zodiac Cipher I 80 100
68 ORYX Stream Cipher Part I II 79 1084
69 The Last Note I 79 100
70 Number Sequence — Part 9 I 78 100
71 Number Sequence — Part 5 I 78 100
72 Enigma Part 2 II 78 1084
73 Hill Cipher with Sudoku Key I 76 100
74 Partial Key Exposure with RSA — Part 1 II 75 1087
75 Enigma Messages with Repeated Letters — Part 3 I 72 100
76 Molehunt (Part 3/3) II 72 1084
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 Smartcard RSA II 68 1084
81 Multilingual Monoalphabetic Substitution I 68 100
82 BCR code (Book-Caesar-RSA) II 66 1089
83 Cascading Encryption — Part 1/3 I 66 100
84 Number Sequence — Part 7 I 65 100
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 Heartbleed — Part 2 I 60 100
89 AES key — encoded in the machine readable zone of a European ePassport II 60 1087
90 Unusual encryption using a diophantine equation II 59 1086
91 Monoalphabetic substitution with camouflage — Part 1 I 56 100
92 An Invisible Message I 54 100
93 The Einstein Enigma II 50 1124
94 M-138 — Part 3 II 49 1098
95 Kaskade-S/T — Part 2 II 48 1085
96 ORYX Stream Cipher Part II II 47 1084
97 Modular Sequences I 46 100
98 Monoalphabetic substitution with camouflage — Part 2 II 45 1087
99 New Year's Greetings — Part 1 I 45 100
100 News from Castle Mansfeld I 45 100
101 Unconcealed RSA messages II 45 1086
102 Keyshanc — Part 1 II 44 1088
103 RSA Factoring Challenge: RSA-704 II 44 0
104 Monoalphabetic substitution with camouflage — Part 4 I 43 100
105 Strange Message from Thessaloniki I 42 100
106 Monoalphabetic substitution with camouflage — Part 3 II 42 1087
107 New Year's Greetings — Part 2 I 42 100
108 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 42 1084
109 Double Column Transposition — Part 4 II 39 1095
110 Music Code — Part 2 II 39 1085
111 An 'unhearable' message I 39 100
112 Weakened Granit — Part 1 I 39 100
113 New Year's Greetings — Part 3 I 39 100
114 Music Code — Part 1 I 39 100
115 CMEA 1 II 39 1084
116 Summer Job II 38 1129
117 Double Column Transposition — Part 2 II 38 1095
118 RSA Factoring Challenge: RSA-210 II 37 0
119 New Year's Greetings — Part 4 I 37 100
120 Pigpen with a twist — Part 2 II 37 1086
121 Ku Klux Klan X 36 var
122 Keyshanc — Part 2 II 34 1088
123 Not-so-Secret Message from Malawi — Part II (ECC) II 34 1084
124 Double Column Transposition — Part 3 II 34 1095
125 Pigpen with a twist — Part 3 II 34 1086
126 Advent-Challenge — Part 2 II 33 1122
127 Heartbleed — Part 3 II 30 1096
128 Trendy Messenger II 30 1129
129 ORYX Stream Cipher — Part 3 (revised) II 30 1091
130 Advent Challenge — Part 4 II 29 1122
131 Kaskade-S/T — Part 3 II 29 1085
132 Fastest in the West II 28 1129
133 Advent Challenge — Part 3 II 28 1122
134 Double Column Transposition — Part 1 II 27 1094
135 Homophonic Encryption — Part 1 II 27 1154
136 Spanish Strip Cipher — Part 1 II 26 1094
137 Lattice Part 1 II 26 1085
138 CMEA 2 III 26 13109
139 Monoalphabetic Substitution with Camouflage — Part 5 II 26 1087
140 Cryptanalysis Hacking Puzzles — Part 1 I 23 100
141 Typex — Part 1 II 23 1090
142 Monoalphabetic Substitution with Nostradamus Flavor II 23 1146
143 RSA Factoring Challenge: RSA-220 II 22 0
144 Spanish Strip Cipher — Part 2 II 22 1094
145 Homophonic Encryption — Part 2 II 22 1154
146 RSA with Special d III 22 13103
147 Homophonic Encryption — Part 3 II 21 1154
148 Typex — Part 2 II 20 1091
149 Homophonic Encryption — Part 4 II 20 1154
150 Polyhomophonic Substitution — Part 1 I 19 101
151 RSA Factoring Challenge: RSA-230 II 18 0
152 Handycipher made in love — Part 1 II 18 1146
153 Breaking a Filter Generator II 17 1135
154 The LoRa Cipher: Logic Randomness — Part 1 II 16 1227
155 M-138 — Part 4 II 16 1098
156 Concealed Messages — Vigenère's Night Sky X 16 var
157 AES ECB Wrong Encoding II 16 1122
158 Weakened Handycipher — Part 1 II 15 1100
159 A Cloaked Substitution Cipher — Part 1 II 15 1169
160 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 15 1107
161 New Year's Greetings — Part 5 II 15 1105
162 Purple 1 II 15 1084
163 Polyphonic Substitution Cipher — Part 1 II 14 1189
164 Weakened Handycipher — Part 3 II 14 1100
165 A Cloaked Substitution Cipher — Part 2 II 14 1169
166 Polyhomophonic Substitution — Part 2 II 13 1260
167 Sigaba Part 1 II 13 1084
168 Weakened Handycipher — Part 2 II 13 1100
169 Handycipher made in love — Part 2 II 13 1156
170 Cipher ID — Part 1 II 13 1188
171 Lightweight Introduction to Lattices — Part 1 I 13 105
172 Flawed Usage of a OTP Cipher by the BND II 13 1101
173 Cascading Encryption — Part 3/3 II 12 1091
174 Cascading Encryption — Part 2/3 II 12 1091
175 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 11 1085
176 The T52 Sturgeon Challenge — Part 1 II 11 1162
177 Polyphonic Substitution Cipher — Part 2 II 11 1208
178 ORYX Stream Cipher — Part 4a II 11 1095
179 Polyhomophonic Substitution — Part 3 II 10 1272
180 Kaskade-S/T — Part 5 II 10 1085
181 The T52 Sturgeon Challenge — Part 2 II 9 1164
182 Akelarre Part 1 II 9 1084
183 Hilly — Part 1 II 8 1112
184 RSA Factoring Challenge: RSA-240 III 8 0
185 The T52 Sturgeon Challenge — Part 3 II 8 1164
186 Double Column Transposition — Part 5 II 8 1095
187 Handycipher — Part 2 II 7 1099
188 The T52 Sturgeon Challenge — Part 4 II 7 1164
189 Handycipher — Part 3 III 6 13362
190 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 6 1116
191 Holographic Encryption — Part 1 II 6 1114
192 RSA Factoring Challenge: RSA-250 III 5 0
193 "The Road" — Part 1 II 5 1140
194 The SIGABA Challenge — Part 1 II 5 1234
195 Handycipher — Part 5 III 5 13495
196 Weakened Handycipher — Part 4 II 5 1107
197 Handycipher — Part 6 III 5 13495
198 Weakened Handycipher — Part 6 II 5 1107
199 Weakened Handycipher — Part 5 II 5 1107
200 RSA Factoring Challenge: RSA-232 III 5 0
201 Handycipher — Part 1 II 5 1099
202 The SIGABA Challenge — Part 2 II 5 1238
203 The T52 Sturgeon Challenge — Part 11 II 4 1167
204 The T52 Sturgeon Challenge — Part 8 II 4 1167
205 The T52 Sturgeon Challenge — Part 12 II 4 1167
206 Notes of an Italian Soldier X 4 var
207 The SIGABA Challenge — Part 3 III 4 15227
208 Spirale — Part 2 II 4 1101
209 Handycipher — Part 4 III 4 13495
210 Spirale — Part 1 II 4 1101
211 Handycipher — Part 8 III 3 13570
212 Differential Cryptanalysis — Part 2 II 3 1214
213 The T52 Sturgeon Challenge — Part 6 II 3 1167
214 The T52 Sturgeon Challenge — Part 7 II 3 1167
215 The T52 Sturgeon Challenge — Part 5 II 3 1167
216 The T52 Sturgeon Challenge — Part 10 II 3 1167
217 The T52 Sturgeon Challenge — Part 9 II 3 1167
218 Weakened ElsieFour — Part 1 II 3 1127
219 The Vatican Challenge — Part 2 X 3 var
220 The Heavy T52 Sturgeon Challenge — Part 4 III 3 15666
221 Holographic Encryption — Part 2 II 3 1114
222 The SIGABA Challenge — Part 4 III 3 15285
223 The Vatican Challenge — Part 1 X 3 var
224 Christmas Challenge 2019: Differential Cryptanalysis — Part 1 II 3 1199
225 Handycipher — Part 9 III 3 13570
226 Extended Handycipher — Part 2 II 3 1099
227 Sigaba Part 2 III 3 13103
228 Extended Handycipher — Part 3 II 3 1099
229 Spirale — Part 3 II 3 1101
230 Extended Handycipher — Part 1 II 3 1099
231 Extended Handycipher — Part 5 III 3 13495
232 Extended Handycipher — Part 4 III 3 13495
233 The SIGABA Challenge — Part 5 III 2 15382
234 Weakened ElsieFour — Part 3 II 2 1119
235 Double Column Transposition X 2 var
236 Extended Handycipher — Part 6 III 2 13495
237 Catherine of Aragon's Letter to King Ferdinand, her Father (1509) X 2 var
238 ElsieFour — Part 1 III 2 13684
239 Unknown Author X 2 var
240 ORYX Stream Cipher — Part 4b III 2 13293
241 Handycipher — Part 7 III 2 13570
242 Handycipher — Part 10 II 1 1160
243 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1107
244 Substitution Cipher with Non-Prefix Codes III 1 13132
245 The Heavy T52 Sturgeon Challenge — Part 1 III 1 14464
246 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1088
247 The Heavy T52 Sturgeon Challenge — Part 7 III 1 15820
248 The Vatican Challenge — Part 4 X 1 var
249 Hilly — Part 2 II 1 1120
250 The Heavy T52 Sturgeon Challenge — Part 5 III 1 15779
251 Beale Ciphers X 1 var
252 RSA Factoring Challenge: RSA-380 III 0 13163
253 The Heavy T52 Sturgeon Challenge — Part 2 III 0 14488
254 The Heavy T52 Sturgeon Challenge — Part 3 III 0 14536
255 RSA Factoring Challenge: RSA-450 III 0 13163
256 RSA Factoring Challenge: RSA-460 III 0 13163
257 RSA Factoring Challenge: RSA-390 III 0 13163
258 RSA Factoring Challenge: RSA-370 III 0 13163
259 RSA Factoring Challenge: RSA-420 III 0 13163
260 RSA Factoring Challenge: RSA-410 III 0 13163
261 RSA Factoring Challenge: RSA-400 III 0 13163
262 RSA Factoring Challenge: RSA-430 III 0 13163
263 RSA Factoring Challenge: RSA-440 III 0 13163
264 The Heavy T52 Sturgeon Challenge — Part 9 III 0 15987
265 RSA Factoring Challenge: RSA-300 III 0 13163
266 The Heavy T52 Sturgeon Challenge — Part 8 III 0 15842
267 RSA Factoring Challenge: RSA-1536 III 0 13163
268 RSA Factoring Challenge: RSA-290 III 0 13163
269 The Heavy T52 Sturgeon Challenge — Part 6 III 0 15799
270 RSA Factoring Challenge: RSA-270 III 0 13163
271 The SIGABA Challenge — Part 6 III 0 15510
272 RSA Factoring Challenge: RSA-280 III 0 13163
273 RSA Factoring Challenge: RSA-309 III 0 13163
274 RSA Factoring Challenge: RSA-1024 III 0 13163
275 RSA Factoring Challenge: RSA-896 III 0 13163
276 RSA Factoring Challenge: RSA-350 III 0 13163
277 RSA Factoring Challenge: RSA-260 III 0 13163
278 RSA Factoring Challenge: RSA-340 III 0 13163
279 RSA Factoring Challenge: RSA-330 III 0 13163
280 RSA Factoring Challenge: RSA-310 III 0 13163
281 RSA Factoring Challenge: RSA-320 III 0 13163
282 RSA Factoring Challenge: RSA-360 III 0 13163
283 Digital Signatures: DSA with Medium Fields III 0 13142
284 World Record Challenge: Break 65 Bits of AES III 0 13103
285 The third ENIGMA M4 message X 0 var
286 Kryptos X 0 var
287 ORYX Stream Cipher — Part 4c III 0 13293
288 Weakened ElsieFour — Part 2 II 0 1127
289 Double Column Transposition Reloaded — Part 3 III 0 13270
290 Spanish Strip Cipher — Part 3 X 0 var
291 Double-Column Transposition/Granit — Part 1 II 0 1100
292 Double-Column Transposition/Granit — Part 2 II 0 1100
293 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1107
294 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1107
295 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1107
296 Weakened Granit — Part 3 II 0 1102
297 Weakened Granit — Part 2 II 0 1102
298 Double-Column Transposition/Granit — Part 3 II 0 1100
299 Spirale — Part 4 III 0 13405
300 Double Column Transposition Reloaded — Part 2 III 0 13270
301 Double Column Transposition Reloaded — Part 1 III 0 13270
302 The Vatican Challenge — Part 3 X 0 var
303 RSA Factoring Challenge: RSA-617 III 0 13163
304 RSA Factoring Challenge: RSA-2048 III 0 13163
305 The Vatican Challenge — Part 5 X 0 var
306 RSA Factoring Challenge: RSA-500 III 0 13163
307 RSA Factoring Challenge: RSA-480 III 0 13163
308 RSA Factoring Challenge: RSA-490 III 0 13163
309 Kaskade-S/T — Part 4 II 0 1085
310 Twelve-Year-Old Murder Case X 0 var
311 ORYX Stream Cipher — Part 4d III 0 13240
312 Dorabella X 0 var
313 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13114
314 "The Road" — Part 2 II 0 1140
315 D'Agapeyeff X 0 var
316 "The Road" — Part 3 II 0 1140
317 RSA Factoring Challenge: RSA-470 III 0 13163
 
 
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   +++    [21:51 - 03.06.2020] Vermentis solved the Level I challenge 'Number Sequence — Part 6'    +++    [15:17 - 03.06.2020] lakis solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [15:11 - 03.06.2020] 3stones solved the Level II challenge 'Unusual encryption using a diophantine equation'    +++    [22:56 - 02.06.2020] nobody solved the Level II challenge 'The T52 Sturgeon Challenge — Part 1'    +++    [06:03 - 02.06.2020] lebolob158 solved the Level I challenge 'Original Caesar Cipher'    +++