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 3520 100
2 Original Caesar Cipher I 2379 100
3 Number Sequence — Part 2 I 1682 100
4 Caesar Encryption I 1170 100
5 Beaver Code I 934 100
6 Letter to the Templars — Part 1 I 813 100
7 Number Sequence — Part 3 I 786 100
8 Letter to the Templars — Part 2 I 646 100
9 Number Sequence — Part 4 I 637 100
10 A hidden word I 623 100
11 Letter to the Templars — Part 3 II 535 1093
12 Monoalphabetic Substitution I 463 100
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 451 100
14 Factorization Cipher — Part 1 I 404 100
15 Cracking SHA1-Hashed Passwords II 400 1088
16 Grille Cipher I 378 100
17 Homophonic Encryption Part 1 I 340 100
18 Homophonic Encryption Part 2 I 293 100
19 Advent-Challenge — Part 1 I 263 100
20 One-Time Pad with Flaws I 258 100
21 Number Sequence — Part 8 I 250 100
22 Snow White and the seven dwarfs I 242 100
23 Alice's Birthday Party (Part 1) II 234 1086
24 Alice's Birthday Party (Part 2) II 226 1086
25 From Russia with Love I 224 100
26 How do you become a big cryptographer? I 184 100
27 Modified Caesar Cipher I 182 100
28 Broadcasting and low exponent — RSA-Attack II 181 1089
29 Reserve Hand Procedure — Part 1 I 166 100
30 Not-so-Secret Message from Malawi — Part I (RSA) II 157 1086
31 Brute-Force-Attack on Triple-DES with Reduced Key Space II 155 1086
32 Letter from the Alleged Countess Julie von Ortenburg I 154 100
33 M-138 — Part 1 I 152 100
34 Classical Ciphers^3 I 150 100
35 Enigma Messages with Repeated Letters — Part 1 I 146 100
36 Hybrid Encryption I II 134 1087
37 Nils away on travel I 132 100
38 Pigpen with a twist — Part 1 I 130 100
39 RSA: Two different keys — same ciphertext II 128 1089
40 The Book Code: A Challenge for Bookworms I 124 100
41 Factorization Cipher — Part 2 II 120 1090
42 Molehunt (Part 1/3) I 119 100
43 Enigma Part 1 II 116 1086
44 Molehunt (Part 2/3) I 116 100
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 1089
48 Trifid Cipher I 102 100
49 ADFGVX — Part 2 I 99 100
50 Number Sequence — Part 6 I 96 100
51 Image Noise I 94 100
52 Kaskade-S/T — Part 1 I 94 100
53 M-138 — Part 2 II 93 1104
54 ADFGVX — Part 1 I 90 100
55 Playfair Encryption I 90 100
56 Enigma Combinatorics I 89 100
57 Playfair with hints about the grid I 87 100
58 Heartbleed — Part 1 I 86 100
59 Double Columnar Transposition I 86 100
60 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 83 100
61 ECDH-Key Exchange for Beginners I 79 100
62 Factorization Cipher — Part 3 II 76 1090
63 ORYX Stream Cipher Part I II 75 1086
64 A hidden word — Part 2 I 74 100
65 Enigma Part 2 II 74 1086
66 Zodiac Cipher I 74 100
67 The Last Note I 74 100
68 Partial Key Exposure with RSA — Part 1 II 69 1091
69 Molehunt (Part 3/3) II 67 1087
70 Hill Cipher with Sudoku Key I 67 100
71 Enigma Messages with Repeated Letters — Part 3 I 66 100
72 Enigma Messages I 65 100
73 Number Sequence — Part 5 I 65 100
74 Enigma Messages with Repeated Letters — Part 2 I 65 100
75 Autokey Cipher I 64 100
76 Enigma Messages with Repeated Letters — Part 5 I 63 100
77 Number Sequence — Part 10 I 63 100
78 Number Sequence — Part 9 I 61 100
79 Multilingual Monoalphabetic Substitution I 61 100
80 Smartcard RSA II 61 1087
81 Cascading Encryption — Part 1/3 I 60 100
82 BCR code (Book-Caesar-RSA) II 60 1093
83 Heartbleed — Part 2 I 58 100
84 Turing Bombe Enigma I I 58 100
85 Enigma Messages with Repeated Letters — Part 4 I 57 100
86 AES key — encoded in the machine readable zone of a European ePassport II 57 1090
87 Number Sequence — Part 7 I 53 100
88 Recycled One-Time Pad I 52 100
89 Monoalphabetic substitution with camouflage — Part 1 I 52 100
90 An Invisible Message I 51 100
91 Unusual encryption using a diophantine equation II 51 1089
92 Kaskade-S/T — Part 2 II 45 1088
93 ORYX Stream Cipher Part II II 43 1086
94 The Einstein Enigma II 42 1149
95 News from Castle Mansfeld I 41 100
96 Keyshanc — Part 1 II 41 1092
97 Unconcealed RSA messages II 41 1090
98 M-138 — Part 3 II 41 1104
99 New Year's Greetings — Part 1 I 41 100
100 Strange Message from Thessaloniki I 40 100
101 Monoalphabetic substitution with camouflage — Part 4 I 40 100
102 Monoalphabetic substitution with camouflage — Part 2 II 40 1090
103 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 39 1087
104 Monoalphabetic substitution with camouflage — Part 3 II 39 1090
105 New Year's Greetings — Part 2 I 38 100
106 Weakened Granit — Part 1 I 38 100
107 Music Code — Part 1 I 37 100
108 Music Code — Part 2 II 37 1088
109 RSA Factoring Challenge: RSA-704 II 36 0
110 New Year's Greetings — Part 3 I 36 100
111 An 'unhearable' message I 36 100
112 Pigpen with a twist — Part 2 II 36 1089
113 Ku Klux Klan X 36 var
114 Double Column Transposition — Part 4 II 35 1100
115 New Year's Greetings — Part 4 I 35 100
116 Double Column Transposition — Part 2 II 34 1100
117 CMEA 1 II 34 1087
118 Not-so-Secret Message from Malawi — Part II (ECC) II 33 1086
119 Pigpen with a twist — Part 3 II 32 1089
120 Keyshanc — Part 2 II 32 1092
121 Cryptanalysis Hacking Puzzles — Part 2 I 32 101
122 Advent-Challenge — Part 2 II 31 1144
123 Double Column Transposition — Part 3 II 30 1100
124 Summer Job II 30 1164
125 RSA Factoring Challenge: RSA-210 II 29 0
126 Kaskade-S/T — Part 3 II 29 1088
127 Heartbleed — Part 3 II 28 1102
128 Advent Challenge — Part 4 II 28 1145
129 ORYX Stream Cipher — Part 3 (revised) II 28 1096
130 Modular Sequences I 27 100
131 Advent Challenge — Part 3 II 26 1145
132 Trendy Messenger II 25 1164
133 Lattice Part 1 II 24 1088
134 Monoalphabetic Substitution with Camouflage — Part 5 II 24 1091
135 CMEA 2 III 23 13160
136 Fastest in the West II 23 1164
137 Double Column Transposition — Part 1 II 22 1100
138 Typex — Part 1 II 21 1095
139 Spanish Strip Cipher — Part 1 II 20 1100
140 RSA with Special d III 20 13153
141 Spanish Strip Cipher — Part 2 II 18 1100
142 Typex — Part 2 II 18 1095
143 M-138 — Part 4 II 16 1104
144 Monoalphabetic Substitution with Nostradamus Flavor II 16 1260
145 Concealed Messages — Vigenère's Night Sky X 16 var
146 Cryptanalysis Hacking Puzzles — Part 1 I 16 101
147 RSA Factoring Challenge: RSA-220 II 15 0
148 Purple 1 II 15 1087
149 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 14 1118
150 New Year's Greetings — Part 5 II 14 1114
151 AES ECB Wrong Encoding II 13 1144
152 Weakened Handycipher — Part 1 II 13 1107
153 Sigaba Part 1 II 12 1086
154 Breaking a Filter Generator II 12 1184
155 Flawed Usage of a OTP Cipher by the BND II 12 1109
156 Weakened Handycipher — Part 3 II 12 1107
157 Handycipher made in love II 12 1260
158 ORYX Stream Cipher — Part 4a II 11 1100
159 Weakened Handycipher — Part 2 II 11 1107
160 RSA Factoring Challenge: RSA-230 II 11 0
161 Cascading Encryption — Part 3/3 II 11 1095
162 Cascading Encryption — Part 2/3 II 11 1095
163 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 11 1088
164 Kaskade-S/T — Part 5 II 9 1088
165 Akelarre Part 1 II 9 1087
166 Hilly — Part 1 II 6 1125
167 Handycipher — Part 3 III 6 13471
168 Handycipher — Part 2 II 6 1105
169 Double Column Transposition — Part 5 II 5 1101
170 Weakened Handycipher — Part 4 II 5 1117
171 Handycipher — Part 6 III 5 13656
172 Handycipher — Part 5 III 5 13656
173 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 5 1133
174 Weakened Handycipher — Part 5 II 5 1117
175 Handycipher — Part 1 II 5 1105
176 Weakened Handycipher — Part 6 II 5 1117
177 Notes of an Italian Soldier X 4 var
178 Handycipher — Part 4 III 4 13656
179 The Vatikan Challenge — Part 2 X 3 var
180 Handycipher — Part 9 III 3 13770
181 Sigaba Part 2 III 3 13153
182 The Vatican Challenge — Part 1 X 3 var
183 Extended Handycipher — Part 1 II 3 1106
184 Extended Handycipher — Part 3 II 3 1106
185 Extended Handycipher — Part 2 II 3 1106
186 Holographic Encryption — Part 1 II 3 1128
187 Handycipher — Part 8 III 3 13770
188 Spirale — Part 2 II 3 1109
189 Spirale — Part 3 II 3 1109
190 Extended Handycipher — Part 5 III 3 13656
191 Extended Handycipher — Part 4 III 3 13656
192 "The Road" — Part 1 II 3 1209
193 Spirale — Part 1 II 3 1109
194 Unknown Author X 2 var
195 Weakened ElsieFour — Part 3 II 2 1138
196 ElsieFour — Part 1 III 2 13968
197 Double Column Transposition X 2 var
198 Handycipher — Part 7 III 2 13770
199 Extended Handycipher — Part 6 III 2 13656
200 Holographic Encryption — Part 2 II 2 1128
201 ORYX Stream Cipher — Part 4b III 2 13382
202 Catherine of Aragon's Letter to King Ferdinand, her Father (1509) X 2 var
203 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1118
204 Hilly — Part 2 II 1 1140
205 Beale Ciphers X 1 var
206 Weakened ElsieFour — Part 1 II 1 1158
207 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1092
208 Substitution Cipher with Non-Prefix Codes III 1 13187
209 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1118
210 RSA Factoring Challenge: RSA-380 III 0 13224
211 RSA Factoring Challenge: RSA-400 III 0 13224
212 RSA Factoring Challenge: RSA-1536 III 0 13224
213 RSA Factoring Challenge: RSA-470 III 0 13224
214 D'Agapeyeff X 0 var
215 RSA Factoring Challenge: RSA-480 III 0 13224
216 "The Road" — Part 2 II 0 1209
217 "The Road" — Part 3 II 0 1209
218 RSA Factoring Challenge: RSA-440 III 0 13224
219 RSA Factoring Challenge: RSA-450 III 0 13224
220 RSA Factoring Challenge: RSA-460 III 0 13224
221 RSA Factoring Challenge: RSA-490 III 0 13224
222 RSA Factoring Challenge: RSA-500 III 0 13224
223 RSA Factoring Challenge: RSA-410 III 0 13224
224 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1118
225 Kryptos X 0 var
226 RSA Factoring Challenge: RSA-420 III 0 13224
227 RSA Factoring Challenge: RSA-2048 III 0 13224
228 RSA Factoring Challenge: RSA-617 III 0 13224
229 Weakened ElsieFour — Part 2 II 0 1158
230 Dorabella X 0 var
231 RSA Factoring Challenge: RSA-390 III 0 13224
232 RSA Factoring Challenge: RSA-360 III 0 13224
233 RSA Factoring Challenge: RSA-250 III 0 13224
234 RSA Factoring Challenge: RSA-240 III 0 13224
235 Twelve-Year-Old Murder Case X 0 var
236 RSA Factoring Challenge: RSA-260 III 0 13224
237 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13165
238 RSA Factoring Challenge: RSA-430 III 0 13224
239 RSA Factoring Challenge: RSA-896 III 0 13224
240 RSA Factoring Challenge: RSA-270 III 0 13224
241 RSA Factoring Challenge: RSA-232 III 0 13224
242 ORYX Stream Cipher — Part 4d III 0 13316
243 Double Column Transposition Reloaded — Part 2 III 0 13352
244 Spanish Strip Cipher — Part 3 X 0 var
245 Double Column Transposition Reloaded — Part 3 III 0 13352
246 Double Column Transposition Reloaded — Part 1 III 0 13352
247 ORYX Stream Cipher — Part 4c III 0 13382
248 The third ENIGMA M4 message X 0 var
249 Digital Signatures: DSA with Medium Fields III 0 13199
250 RSA Factoring Challenge: RSA-280 III 0 13224
251 RSA Factoring Challenge: RSA-290 III 0 13224
252 Weakened Granit — Part 2 II 0 1110
253 World Record Challenge: Break 65 Bits of AES III 0 13153
254 Spirale — Part 4 III 0 13528
255 Weakened Granit — Part 3 II 0 1110
256 RSA Factoring Challenge: RSA-340 III 0 13224
257 RSA Factoring Challenge: RSA-370 III 0 13224
258 Kaskade-S/T — Part 4 II 0 1088
259 RSA Factoring Challenge: RSA-350 III 0 13224
260 RSA Factoring Challenge: RSA-330 III 0 13224
261 Double-Column Transposition/Granit — Part 3 II 0 1108
262 RSA Factoring Challenge: RSA-1024 III 0 13224
263 RSA Factoring Challenge: RSA-309 III 0 13224
264 RSA Factoring Challenge: RSA-300 III 0 13224
265 RSA Factoring Challenge: RSA-310 III 0 13224
266 RSA Factoring Challenge: RSA-320 III 0 13224
267 Double-Column Transposition/Granit — Part 2 II 0 1108
268 Double-Column Transposition/Granit — Part 1 II 0 1108
269 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1118
 
 
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   +++    [21:51 - 24.04.2019] r_karoly solved the Level I challenge 'Original Caesar Cipher'    +++    [14:24 - 24.04.2019] maryllb solved the Level I challenge 'Number Sequence'    +++    [14:20 - 24.04.2019] lim0n solved the Level I challenge 'Factorization Cipher — Part 1'    +++    [14:17 - 24.04.2019] lim0n solved the Level I challenge 'Number Sequence — Part 8'    +++    [13:31 - 24.04.2019] Hopfrog solved the Level I challenge 'Number Sequence — Part 2'    +++