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 3383 100
2 Original Caesar Cipher I 2280 100
3 Number Sequence — Part 2 I 1595 100
4 Caesar Encryption I 1133 100
5 Beaver Code I 888 100
6 Letter to the Templars — Part 1 I 785 100
7 Number Sequence — Part 3 I 736 100
8 Letter to the Templars — Part 2 I 625 100
9 Number Sequence — Part 4 I 593 100
10 A hidden word I 581 100
11 Letter to the Templars — Part 3 II 510 1094
12 Monoalphabetic Substitution I 460 100
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 435 100
14 Factorization Cipher — Part 1 I 387 100
15 Cracking SHA1-Hashed Passwords II 364 1089
16 Grille Cipher I 363 100
17 Homophonic Encryption Part 1 I 328 100
18 Homophonic Encryption Part 2 I 281 100
19 One-Time Pad with Flaws I 248 100
20 Advent-Challenge — Part 1 I 240 100
21 Snow White and the seven dwarfs I 236 100
22 Alice's Birthday Party (Part 1) II 220 1087
23 From Russia with Love I 214 100
24 Number Sequence — Part 8 I 213 100
25 Alice's Birthday Party (Part 2) II 211 1087
26 How do you become a big cryptographer? I 174 100
27 Broadcasting and low exponent — RSA-Attack II 171 1090
28 Modified Caesar Cipher I 170 100
29 Reserve Hand Procedure — Part 1 I 164 100
30 Letter from the Alleged Countess Julie von Ortenburg I 152 100
31 Not-so-Secret Message from Malawi — Part I (RSA) II 149 1087
32 M-138 — Part 1 I 147 100
33 Classical Ciphers^3 I 145 100
34 Brute-Force-Attack on Triple-DES with Reduced Key Space II 143 1087
35 Enigma Messages with Repeated Letters — Part 1 I 142 100
36 Nils away on travel I 130 100
37 Hybrid Encryption I II 129 1087
38 Pigpen with a twist — Part 1 I 125 100
39 RSA: Two different keys — same ciphertext II 123 1090
40 The Book Code: A Challenge for Bookworms I 120 100
41 Molehunt (Part 1/3) I 119 100
42 Molehunt (Part 2/3) I 115 100
43 Factorization Cipher — Part 2 II 115 1091
44 Enigma Part 1 II 114 1087
45 ¿No Hablas Español? No problemo! I 113 100
46 A Secret Message from Castle Mansfeld I 110 100
47 Trifid Cipher I 102 100
48 A really long number sequence II 100 1090
49 ADFGVX — Part 2 I 99 100
50 Kaskade-S/T — Part 1 I 94 100
51 Number Sequence — Part 6 I 90 100
52 ADFGVX — Part 1 I 90 100
53 Image Noise I 89 100
54 Enigma Combinatorics I 88 100
55 Playfair Encryption I 87 100
56 M-138 — Part 2 II 87 1106
57 Heartbleed — Part 1 I 86 100
58 Double Columnar Transposition I 84 100
59 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 83 100
60 Playfair with hints about the grid 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 73 1087
65 Enigma Part 2 II 72 1087
66 A hidden word — Part 2 I 72 100
67 Factorization Cipher — Part 3 II 71 1091
68 Molehunt (Part 3/3) II 66 1087
69 Enigma Messages with Repeated Letters — Part 3 I 66 100
70 Partial Key Exposure with RSA — Part 1 II 65 1091
71 Enigma Messages with Repeated Letters — Part 2 I 65 100
72 Hill Cipher with Sudoku Key I 64 100
73 Number Sequence — Part 5 I 64 100
74 Enigma Messages I 63 100
75 Enigma Messages with Repeated Letters — Part 5 I 61 100
76 BCR code (Book-Caesar-RSA) II 61 1094
77 Cascading Encryption — Part 1/3 I 60 100
78 Smartcard RSA II 60 1087
79 Multilingual Monoalphabetic Substitution I 59 100
80 Heartbleed — Part 2 I 58 100
81 Turing Bombe Enigma I I 58 100
82 Number Sequence — Part 10 I 57 100
83 Enigma Messages with Repeated Letters — Part 4 I 57 100
84 AES key — encoded in the machine readable zone of a European ePassport II 56 1091
85 Number Sequence — Part 9 I 55 100
86 Autokey Cipher I 53 101
87 Number Sequence — Part 7 I 51 100
88 Recycled One-Time Pad I 51 100
89 Unusual encryption using a diophantine equation II 50 1090
90 An Invisible Message I 50 100
91 Monoalphabetic substitution with camouflage — Part 1 I 50 100
92 Kaskade-S/T — Part 2 II 45 1088
93 News from Castle Mansfeld I 41 100
94 Keyshanc — Part 1 II 41 1092
95 ORYX Stream Cipher Part II II 41 1087
96 Strange Message from Thessaloniki I 40 100
97 The Einstein Enigma II 40 1160
98 New Year's Greetings — Part 1 I 40 100
99 M-138 — Part 3 II 40 1106
100 Unconcealed RSA messages II 39 1091
101 Monoalphabetic substitution with camouflage — Part 2 II 39 1091
102 Monoalphabetic substitution with camouflage — Part 4 I 39 100
103 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 39 1088
104 Weakened Granit — Part 1 I 38 100
105 Music Code — Part 1 I 37 100
106 Music Code — Part 2 II 37 1089
107 New Year's Greetings — Part 2 I 37 100
108 Monoalphabetic substitution with camouflage — Part 3 II 36 1091
109 Double Column Transposition — Part 4 II 35 1102
110 Ku Klux Klan X 35 var
111 RSA Factoring Challenge: RSA-704 II 35 0
112 New Year's Greetings — Part 3 I 35 100
113 An 'unhearable' message I 35 100
114 New Year's Greetings — Part 4 I 34 100
115 CMEA 1 II 34 1088
116 Double Column Transposition — Part 2 II 34 1102
117 Pigpen with a twist — Part 2 II 34 1090
118 Keyshanc — Part 2 II 32 1092
119 Pigpen with a twist — Part 3 II 31 1090
120 Double Column Transposition — Part 3 II 30 1102
121 Not-so-Secret Message from Malawi — Part II (ECC) II 30 1087
122 Summer Job II 30 1182
123 Advent-Challenge — Part 2 II 30 1153
124 Kaskade-S/T — Part 3 II 28 1088
125 Heartbleed — Part 3 II 28 1104
126 RSA Factoring Challenge: RSA-210 II 28 0
127 Advent Challenge — Part 4 II 26 1154
128 ORYX Stream Cipher — Part 3 (revised) II 26 1097
129 Trendy Messenger II 25 1182
130 Advent Challenge — Part 3 II 25 1154
131 Lattice Part 1 II 24 1088
132 CMEA 2 III 23 13174
133 Fastest in the West II 23 1182
134 Monoalphabetic Substitution with Camouflage — Part 5 II 23 1092
135 Double Column Transposition — Part 1 II 22 1101
136 Modular Sequences I 22 101
137 RSA with Special d III 20 13166
138 Typex — Part 1 II 20 1096
139 Spanish Strip Cipher — Part 1 II 19 1101
140 Typex — Part 2 II 18 1096
141 Spanish Strip Cipher — Part 2 II 17 1101
142 Concealed Messages — Vigenère's Night Sky X 16 var
143 Cryptanalysis Hacking Puzzles — Part 1 I 15 101
144 M-138 — Part 4 II 15 1106
145 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 14 1121
146 RSA Factoring Challenge: RSA-220 II 14 0
147 Purple 1 II 14 1087
148 AES ECB Wrong Encoding II 13 1153
149 Flawed Usage of a OTP Cipher by the BND II 12 1111
150 New Year's Greetings — Part 5 II 12 1117
151 Sigaba Part 1 II 12 1087
152 Breaking a Filter Generator II 11 1221
153 Cryptanalysis Hacking Puzzles — Part 2 I 11 111
154 Weakened Handycipher — Part 1 II 11 1109
155 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 11 1089
156 Weakened Handycipher — Part 3 II 11 1109
157 ORYX Stream Cipher — Part 4a II 10 1101
158 Cascading Encryption — Part 2/3 II 10 1096
159 Weakened Handycipher — Part 2 II 10 1109
160 Cascading Encryption — Part 3/3 II 10 1096
161 Kaskade-S/T — Part 5 II 9 1089
162 Akelarre Part 1 II 9 1088
163 RSA Factoring Challenge: RSA-230 II 8 0
164 Handycipher — Part 2 II 6 1107
165 Handycipher — Part 3 III 6 13502
166 Hilly — Part 1 II 5 1129
167 Handycipher — Part 5 III 5 13706
168 Double Column Transposition — Part 5 II 5 1103
169 Handycipher — Part 1 II 5 1107
170 Handycipher — Part 6 III 5 13706
171 Weakened Handycipher — Part 5 II 5 1120
172 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 5 1139
173 Weakened Handycipher — Part 4 II 5 1120
174 Weakened Handycipher — Part 6 II 5 1120
175 Handycipher — Part 4 III 4 13706
176 Notes of an Italian Soldier X 4 var
177 Extended Handycipher — Part 1 II 3 1108
178 Spirale — Part 1 II 3 1111
179 The Vatikan Challenge — Part 2 X 3 var
180 Spirale — Part 3 II 3 1111
181 The Vatican Challenge — Part 1 X 3 var
182 "The Road" — Part 1 II 3 1305
183 Extended Handycipher — Part 2 II 3 1108
184 Sigaba Part 2 III 3 13166
185 Extended Handycipher — Part 4 III 3 13706
186 Extended Handycipher — Part 3 II 3 1108
187 Holographic Encryption — Part 1 II 3 1133
188 Spirale — Part 2 II 3 1111
189 Weakened ElsieFour — Part 3 II 2 1146
190 ElsieFour — Part 1 III 2 14074
191 Handycipher — Part 9 III 2 13837
192 Handycipher — Part 8 III 2 13837
193 ORYX Stream Cipher — Part 4b III 2 13407
194 Unknown Author X 2 var
195 Extended Handycipher — Part 5 III 2 13706
196 Catherine of Aragon's Letter to King Ferdinand, her Father (1509) X 2 var
197 Holographic Encryption — Part 2 II 2 1133
198 Double Column Transposition X 2 var
199 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1121
200 Hilly — Part 2 II 1 1147
201 Weakened ElsieFour — Part 1 II 1 1173
202 Beale Ciphers X 1 var
203 Extended Handycipher — Part 6 III 1 13706
204 Handycipher — Part 7 III 1 13837
205 Substitution Cipher with Non-Prefix Codes III 1 13202
206 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1093
207 "The Road" — Part 3 II 0 1305
208 "The Road" — Part 2 II 0 1305
209 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1121
210 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1121
211 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1121
212 Weakened ElsieFour — Part 2 II 0 1173
213 Spanish Strip Cipher — Part 3 X 0 var
214 RSA Factoring Challenge: RSA-370 III 0 13240
215 RSA Factoring Challenge: RSA-380 III 0 13240
216 RSA Factoring Challenge: RSA-360 III 0 13240
217 RSA Factoring Challenge: RSA-350 III 0 13240
218 RSA Factoring Challenge: RSA-340 III 0 13240
219 RSA Factoring Challenge: RSA-390 III 0 13240
220 RSA Factoring Challenge: RSA-400 III 0 13240
221 RSA Factoring Challenge: RSA-440 III 0 13240
222 RSA Factoring Challenge: RSA-450 III 0 13240
223 RSA Factoring Challenge: RSA-430 III 0 13240
224 RSA Factoring Challenge: RSA-420 III 0 13240
225 RSA Factoring Challenge: RSA-410 III 0 13240
226 RSA Factoring Challenge: RSA-330 III 0 13240
227 RSA Factoring Challenge: RSA-320 III 0 13240
228 RSA Factoring Challenge: RSA-260 III 0 13240
229 RSA Factoring Challenge: RSA-270 III 0 13240
230 RSA Factoring Challenge: RSA-250 III 0 13240
231 RSA Factoring Challenge: RSA-240 III 0 13240
232 RSA Factoring Challenge: RSA-232 III 0 13240
233 RSA Factoring Challenge: RSA-896 III 0 13240
234 RSA Factoring Challenge: RSA-280 III 0 13240
235 RSA Factoring Challenge: RSA-1024 III 0 13240
236 RSA Factoring Challenge: RSA-310 III 0 13240
237 RSA Factoring Challenge: RSA-309 III 0 13240
238 RSA Factoring Challenge: RSA-300 III 0 13240
239 RSA Factoring Challenge: RSA-290 III 0 13240
240 RSA Factoring Challenge: RSA-460 III 0 13240
241 RSA Factoring Challenge: RSA-1536 III 0 13240
242 Double Column Transposition Reloaded — Part 2 III 0 13376
243 Double Column Transposition Reloaded — Part 3 III 0 13376
244 Double Column Transposition Reloaded — Part 1 III 0 13376
245 Twelve-Year-Old Murder Case X 0 var
246 Kaskade-S/T — Part 4 II 0 1089
247 ORYX Stream Cipher — Part 4c III 0 13407
248 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13179
249 Spirale — Part 4 III 0 13564
250 Weakened Granit — Part 2 II 0 1112
251 Double-Column Transposition/Granit — Part 3 II 0 1110
252 Double-Column Transposition/Granit — Part 2 II 0 1110
253 Double-Column Transposition/Granit — Part 1 II 0 1110
254 D'Agapeyeff X 0 var
255 ORYX Stream Cipher — Part 4d III 0 13337
256 RSA Factoring Challenge: RSA-500 III 0 13240
257 RSA Factoring Challenge: RSA-617 III 0 13240
258 RSA Factoring Challenge: RSA-490 III 0 13240
259 RSA Factoring Challenge: RSA-480 III 0 13240
260 RSA Factoring Challenge: RSA-470 III 0 13240
261 RSA Factoring Challenge: RSA-2048 III 0 13240
262 The third ENIGMA M4 message X 0 var
263 Dorabella X 0 var
264 World Record Challenge: Break 65 Bits of AES III 0 13166
265 Kryptos X 0 var
266 Digital Signatures: DSA with Medium Fields III 0 13214
267 Weakened Granit — Part 3 II 0 1112
 
 
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   +++    [13:07 - 17.01.2019] chingyinwan123 solved the Level I challenge 'Number Sequence — Part 2'    +++    [13:03 - 17.01.2019] chingyinwan123 solved the Level I challenge 'Original Caesar Cipher'    +++    [12:54 - 17.01.2019] chingyinwan123 solved the Level I challenge 'Number Sequence'    +++    [08:27 - 17.01.2019] FoM solved the Level II challenge 'Monoalphabetic substitution with camouflage — Part 2'    +++    [12:16 - 16.01.2019] mhoefl solved the Level I challenge 'Number Sequence — Part 4'    +++