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 3428 100
2 Original Caesar Cipher I 2312 100
3 Number Sequence — Part 2 I 1621 100
4 Caesar Encryption I 1147 100
5 Beaver Code I 899 100
6 Letter to the Templars — Part 1 I 795 100
7 Number Sequence — Part 3 I 743 100
8 Letter to the Templars — Part 2 I 633 100
9 Number Sequence — Part 4 I 599 100
10 A hidden word I 590 100
11 Letter to the Templars — Part 3 II 517 1094
12 Monoalphabetic Substitution I 463 100
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 442 100
14 Factorization Cipher — Part 1 I 394 100
15 Grille Cipher I 370 100
16 Cracking SHA1-Hashed Passwords II 368 1088
17 Homophonic Encryption Part 1 I 334 100
18 Homophonic Encryption Part 2 I 287 100
19 One-Time Pad with Flaws I 252 100
20 Advent-Challenge — Part 1 I 245 100
21 Snow White and the seven dwarfs I 237 100
22 Alice's Birthday Party (Part 1) II 223 1087
23 Number Sequence — Part 8 I 217 100
24 From Russia with Love I 217 100
25 Alice's Birthday Party (Part 2) II 212 1087
26 How do you become a big cryptographer? I 177 100
27 Broadcasting and low exponent — RSA-Attack II 173 1089
28 Modified Caesar Cipher I 171 100
29 Reserve Hand Procedure — Part 1 I 164 100
30 Letter from the Alleged Countess Julie von Ortenburg I 154 100
31 Not-so-Secret Message from Malawi — Part I (RSA) II 151 1087
32 M-138 — Part 1 I 149 100
33 Classical Ciphers^3 I 147 100
34 Brute-Force-Attack on Triple-DES with Reduced Key Space II 144 1087
35 Enigma Messages with Repeated Letters — Part 1 I 143 100
36 Nils away on travel I 131 100
37 Hybrid Encryption I II 131 1087
38 Pigpen with a twist — Part 1 I 128 100
39 RSA: Two different keys — same ciphertext II 123 1089
40 The Book Code: A Challenge for Bookworms I 122 100
41 Molehunt (Part 1/3) I 119 100
42 Factorization Cipher — Part 2 II 118 1090
43 Enigma Part 1 II 115 1087
44 Molehunt (Part 2/3) I 115 100
45 ¿No Hablas Español? No problemo! I 115 100
46 A Secret Message from Castle Mansfeld I 110 100
47 A really long number sequence II 102 1090
48 Trifid Cipher I 102 100
49 ADFGVX — Part 2 I 99 100
50 Kaskade-S/T — Part 1 I 94 100
51 Image Noise I 94 100
52 Number Sequence — Part 6 I 92 100
53 M-138 — Part 2 II 90 1105
54 ADFGVX — Part 1 I 90 100
55 Enigma Combinatorics I 88 100
56 Playfair Encryption I 88 100
57 Heartbleed — Part 1 I 86 100
58 Double Columnar Transposition I 85 100
59 Playfair with hints about the grid I 84 100
60 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 83 100
61 ECDH-Key Exchange for Beginners I 78 100
62 Zodiac Cipher I 74 100
63 The Last Note I 74 100
64 ORYX Stream Cipher Part I II 74 1087
65 Enigma Part 2 II 73 1087
66 A hidden word — Part 2 I 73 100
67 Factorization Cipher — Part 3 II 73 1091
68 Enigma Messages with Repeated Letters — Part 3 I 66 100
69 Molehunt (Part 3/3) II 66 1087
70 Enigma Messages with Repeated Letters — Part 2 I 65 100
71 Hill Cipher with Sudoku Key I 65 100
72 Partial Key Exposure with RSA — Part 1 II 65 1091
73 Number Sequence — Part 5 I 64 100
74 Enigma Messages I 63 100
75 Enigma Messages with Repeated Letters — Part 5 I 62 100
76 BCR code (Book-Caesar-RSA) II 61 1093
77 Multilingual Monoalphabetic Substitution I 61 100
78 Smartcard RSA II 60 1087
79 Cascading Encryption — Part 1/3 I 60 100
80 Number Sequence — Part 10 I 58 100
81 Turing Bombe Enigma I I 58 100
82 Heartbleed — Part 2 I 58 100
83 Enigma Messages with Repeated Letters — Part 4 I 57 100
84 Number Sequence — Part 9 I 57 100
85 AES key — encoded in the machine readable zone of a European ePassport II 56 1091
86 Autokey Cipher I 54 101
87 Number Sequence — Part 7 I 52 100
88 An Invisible Message I 51 100
89 Recycled One-Time Pad I 51 100
90 Unusual encryption using a diophantine equation II 50 1090
91 Monoalphabetic substitution with camouflage — Part 1 I 50 100
92 Kaskade-S/T — Part 2 II 45 1088
93 ORYX Stream Cipher Part II II 42 1087
94 M-138 — Part 3 II 41 1105
95 News from Castle Mansfeld I 41 100
96 Keyshanc — Part 1 II 41 1092
97 New Year's Greetings — Part 1 I 41 100
98 The Einstein Enigma II 40 1156
99 Unconcealed RSA messages II 40 1090
100 Monoalphabetic substitution with camouflage — Part 4 I 40 100
101 Strange Message from Thessaloniki I 40 100
102 Monoalphabetic substitution with camouflage — Part 2 II 39 1091
103 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 39 1088
104 Monoalphabetic substitution with camouflage — Part 3 II 38 1091
105 New Year's Greetings — Part 2 I 38 100
106 Weakened Granit — Part 1 I 38 100
107 Music Code — Part 2 II 37 1089
108 Music Code — Part 1 I 37 100
109 New Year's Greetings — Part 3 I 36 100
110 An 'unhearable' message I 36 100
111 Ku Klux Klan X 36 var
112 Double Column Transposition — Part 4 II 35 1101
113 RSA Factoring Challenge: RSA-704 II 35 0
114 Pigpen with a twist — Part 2 II 35 1090
115 New Year's Greetings — Part 4 I 35 100
116 CMEA 1 II 34 1087
117 Double Column Transposition — Part 2 II 34 1101
118 Pigpen with a twist — Part 3 II 32 1090
119 Keyshanc — Part 2 II 32 1092
120 Not-so-Secret Message from Malawi — Part II (ECC) II 31 1087
121 Advent-Challenge — Part 2 II 30 1150
122 Double Column Transposition — Part 3 II 30 1101
123 Summer Job II 30 1175
124 RSA Factoring Challenge: RSA-210 II 28 0
125 Heartbleed — Part 3 II 28 1103
126 Kaskade-S/T — Part 3 II 28 1088
127 ORYX Stream Cipher — Part 3 (revised) II 27 1096
128 Advent Challenge — Part 4 II 26 1150
129 Trendy Messenger II 25 1175
130 Advent Challenge — Part 3 II 25 1150
131 Lattice Part 1 II 24 1088
132 Monoalphabetic Substitution with Camouflage — Part 5 II 24 1091
133 Modular Sequences I 23 101
134 CMEA 2 III 23 13169
135 Fastest in the West II 23 1175
136 Double Column Transposition — Part 1 II 22 1101
137 RSA with Special d III 20 13162
138 Typex — Part 1 II 20 1095
139 Spanish Strip Cipher — Part 1 II 20 1101
140 Typex — Part 2 II 18 1096
141 Spanish Strip Cipher — Part 2 II 18 1101
142 Cryptanalysis Hacking Puzzles — Part 2 I 17 102
143 Cryptanalysis Hacking Puzzles — Part 1 I 16 101
144 Concealed Messages — Vigenère's Night Sky X 16 var
145 M-138 — Part 4 II 15 1105
146 RSA Factoring Challenge: RSA-220 II 14 0
147 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 14 1120
148 Monoalphabetic Substitution with Nostradamus Flavor II 14 1613
149 Purple 1 II 14 1087
150 New Year's Greetings — Part 5 II 13 1116
151 AES ECB Wrong Encoding II 13 1150
152 Flawed Usage of a OTP Cipher by the BND II 12 1110
153 Sigaba Part 1 II 12 1087
154 Weakened Handycipher — Part 1 II 11 1108
155 Weakened Handycipher — Part 3 II 11 1108
156 Breaking a Filter Generator II 11 1205
157 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 11 1088
158 Weakened Handycipher — Part 2 II 10 1108
159 Cascading Encryption — Part 3/3 II 10 1096
160 Cascading Encryption — Part 2/3 II 10 1096
161 ORYX Stream Cipher — Part 4a II 10 1101
162 Handycipher made in love II 9 1613
163 Akelarre Part 1 II 9 1087
164 Kaskade-S/T — Part 5 II 9 1089
165 RSA Factoring Challenge: RSA-230 II 9 0
166 Handycipher — Part 3 III 6 13491
167 Handycipher — Part 2 II 6 1107
168 Double Column Transposition — Part 5 II 5 1102
169 Handycipher — Part 6 III 5 13688
170 Handycipher — Part 5 III 5 13688
171 Handycipher — Part 1 II 5 1107
172 Weakened Handycipher — Part 4 II 5 1119
173 Hilly — Part 1 II 5 1128
174 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 5 1137
175 Weakened Handycipher — Part 5 II 5 1119
176 Weakened Handycipher — Part 6 II 5 1119
177 Notes of an Italian Soldier X 4 var
178 Handycipher — Part 4 III 4 13688
179 Extended Handycipher — Part 1 II 3 1107
180 The Vatican Challenge — Part 1 X 3 var
181 Handycipher — Part 8 III 3 13812
182 Spirale — Part 1 II 3 1110
183 Extended Handycipher — Part 2 II 3 1107
184 Extended Handycipher — Part 3 II 3 1107
185 Sigaba Part 2 III 3 13162
186 Spirale — Part 2 II 3 1110
187 Spirale — Part 3 II 3 1110
188 Holographic Encryption — Part 1 II 3 1131
189 Handycipher — Part 9 III 3 13812
190 The Vatikan Challenge — Part 2 X 3 var
191 Extended Handycipher — Part 4 III 3 13688
192 Extended Handycipher — Part 5 III 3 13688
193 "The Road" — Part 1 II 3 1252
194 Double Column Transposition X 2 var
195 Extended Handycipher — Part 6 III 2 13688
196 Weakened ElsieFour — Part 3 II 2 1143
197 ORYX Stream Cipher — Part 4b III 2 13398
198 Unknown Author X 2 var
199 Holographic Encryption — Part 2 II 2 1131
200 Catherine of Aragon's Letter to King Ferdinand, her Father (1509) X 2 var
201 ElsieFour — Part 1 III 2 14033
202 Handycipher — Part 7 III 2 13812
203 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1120
204 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1093
205 Weakened ElsieFour — Part 1 II 1 1167
206 Hilly — Part 2 II 1 1144
207 Substitution Cipher with Non-Prefix Codes III 1 13197
208 Beale Ciphers X 1 var
209 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1120
210 Kryptos X 0 var
211 RSA Factoring Challenge: RSA-460 III 0 13234
212 RSA Factoring Challenge: RSA-1536 III 0 13234
213 D'Agapeyeff X 0 var
214 RSA Factoring Challenge: RSA-470 III 0 13234
215 "The Road" — Part 2 II 0 1252
216 "The Road" — Part 3 II 0 1252
217 RSA Factoring Challenge: RSA-430 III 0 13234
218 RSA Factoring Challenge: RSA-440 III 0 13234
219 RSA Factoring Challenge: RSA-450 III 0 13234
220 RSA Factoring Challenge: RSA-480 III 0 13234
221 RSA Factoring Challenge: RSA-490 III 0 13234
222 RSA Factoring Challenge: RSA-410 III 0 13234
223 RSA Factoring Challenge: RSA-400 III 0 13234
224 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1120
225 RSA Factoring Challenge: RSA-2048 III 0 13234
226 RSA Factoring Challenge: RSA-617 III 0 13234
227 RSA Factoring Challenge: RSA-500 III 0 13234
228 Weakened ElsieFour — Part 2 II 0 1167
229 Dorabella X 0 var
230 RSA Factoring Challenge: RSA-390 III 0 13234
231 RSA Factoring Challenge: RSA-360 III 0 13234
232 RSA Factoring Challenge: RSA-250 III 0 13234
233 Twelve-Year-Old Murder Case X 0 var
234 RSA Factoring Challenge: RSA-240 III 0 13234
235 RSA Factoring Challenge: RSA-260 III 0 13234
236 RSA Factoring Challenge: RSA-270 III 0 13234
237 RSA Factoring Challenge: RSA-280 III 0 13234
238 RSA Factoring Challenge: RSA-896 III 0 13234
239 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13174
240 RSA Factoring Challenge: RSA-232 III 0 13234
241 ORYX Stream Cipher — Part 4d III 0 13329
242 Double Column Transposition Reloaded — Part 2 III 0 13367
243 Double Column Transposition Reloaded — Part 3 III 0 13367
244 Kaskade-S/T — Part 4 II 0 1089
245 Spanish Strip Cipher — Part 3 X 0 var
246 Double Column Transposition Reloaded — Part 1 III 0 13367
247 The third ENIGMA M4 message X 0 var
248 ORYX Stream Cipher — Part 4c III 0 13398
249 Digital Signatures: DSA with Medium Fields III 0 13209
250 RSA Factoring Challenge: RSA-420 III 0 13234
251 RSA Factoring Challenge: RSA-290 III 0 13234
252 Weakened Granit — Part 2 II 0 1111
253 World Record Challenge: Break 65 Bits of AES III 0 13162
254 RSA Factoring Challenge: RSA-330 III 0 13234
255 Weakened Granit — Part 3 II 0 1111
256 RSA Factoring Challenge: RSA-340 III 0 13234
257 RSA Factoring Challenge: RSA-380 III 0 13234
258 RSA Factoring Challenge: RSA-370 III 0 13234
259 RSA Factoring Challenge: RSA-350 III 0 13234
260 Spirale — Part 4 III 0 13551
261 Double-Column Transposition/Granit — Part 3 II 0 1109
262 RSA Factoring Challenge: RSA-1024 III 0 13234
263 RSA Factoring Challenge: RSA-309 III 0 13234
264 RSA Factoring Challenge: RSA-300 III 0 13234
265 RSA Factoring Challenge: RSA-310 III 0 13234
266 RSA Factoring Challenge: RSA-320 III 0 13234
267 Double-Column Transposition/Granit — Part 2 II 0 1109
268 Double-Column Transposition/Granit — Part 1 II 0 1109
269 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1120
 
 
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   +++    [03:57 - 21.02.2019] madness solved the Level I challenge '¿No Hablas Español? No problemo!'    +++    [01:21 - 21.02.2019] madness solved the Level I challenge 'How do you become a big cryptographer?'    +++    [22:05 - 20.02.2019] tripleedged solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [21:29 - 20.02.2019] tripleedged solved the Level II challenge 'Monoalphabetic Substitution with Nostradamus Flavor'    +++    [15:14 - 20.02.2019] silva solved the Level II challenge 'Monoalphabetic Substitution with Nostradamus Flavor'    +++