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 3173 100
2 Original Caesar Cipher I 2103 100
3 Number Sequence — Part 2 I 1472 100
4 Caesar Encryption I 1061 100
5 Beaver Code I 814 100
6 Letter to the Templars — Part 1 I 733 100
7 Number Sequence — Part 3 I 670 100
8 Letter to the Templars — Part 2 I 587 100
9 Number Sequence — Part 4 I 540 100
10 A hidden word I 531 100
11 Letter to the Templars — Part 3 II 474 1097
12 Monoalphabetic Substitution I 453 100
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 412 100
14 Factorization Cipher — Part 1 I 372 100
15 Grille Cipher I 342 100
16 Cracking SHA1-Hashed Passwords II 334 1091
17 Homophonic Encryption Part 1 I 318 100
18 Homophonic Encryption Part 2 I 272 100
19 One-Time Pad with Flaws I 245 100
20 Snow White and the seven dwarfs I 230 100
21 Alice's Birthday Party (Part 1) II 212 1089
22 Alice's Birthday Party (Part 2) II 202 1089
23 From Russia with Love I 200 100
24 Number Sequence — Part 8 I 188 100
25 How do you become a big cryptographer? I 169 100
26 Modified Caesar Cipher I 167 100
27 Broadcasting and low exponent — RSA-Attack II 166 1092
28 Reserve Hand Procedure — Part 1 I 161 100
29 Letter from the Alleged Countess Julie von Ortenburg I 150 100
30 Advent-Challenge — Part 1 I 149 101
31 Not-so-Secret Message from Malawi — Part I (RSA) II 147 1089
32 Classical Ciphers^3 I 143 100
33 M-138 — Part 1 I 140 100
34 Enigma Messages with Repeated Letters — Part 1 I 136 100
35 Brute-Force-Attack on Triple-DES with Reduced Key Space II 132 1089
36 Hybrid Encryption I II 124 1089
37 Nils away on travel I 123 100
38 Pigpen with a twist — Part 1 I 121 100
39 RSA: Two different keys — same ciphertext II 120 1092
40 The Book Code: A Challenge for Bookworms I 119 100
41 Molehunt (Part 1/3) I 112 100
42 Enigma Part 1 II 111 1089
43 Factorization Cipher — Part 2 II 111 1093
44 Molehunt (Part 2/3) I 108 100
45 A Secret Message from Castle Mansfeld I 107 100
46 ¿No Hablas Español? No problemo! I 105 100
47 Trifid Cipher I 99 100
48 ADFGVX — Part 2 I 95 100
49 A really long number sequence II 95 1092
50 Kaskade-S/T — Part 1 I 90 100
51 ADFGVX — Part 1 I 87 100
52 Enigma Combinatorics I 85 100
53 Playfair Encryption I 84 100
54 Heartbleed — Part 1 I 83 100
55 M-138 — Part 2 II 83 1111
56 Double Columnar Transposition I 82 100
57 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 81 100
58 Number Sequence — Part 6 I 80 100
59 Playfair with hints about the grid I 79 100
60 Image Noise I 76 100
61 ECDH-Key Exchange for Beginners I 76 100
62 ORYX Stream Cipher Part I II 72 1089
63 The Last Note I 71 100
64 Zodiac Cipher I 70 100
65 Factorization Cipher — Part 3 II 70 1093
66 Enigma Part 2 II 70 1089
67 A hidden word — Part 2 I 68 100
68 Enigma Messages with Repeated Letters — Part 3 I 63 100
69 Molehunt (Part 3/3) II 63 1089
70 Hill Cipher with Sudoku Key I 62 100
71 Enigma Messages with Repeated Letters — Part 2 I 62 100
72 Partial Key Exposure with RSA — Part 1 II 62 1094
73 BCR code (Book-Caesar-RSA) II 60 1096
74 Smartcard RSA II 59 1089
75 Enigma Messages I 59 100
76 Enigma Messages with Repeated Letters — Part 5 I 58 100
77 Cascading Encryption — Part 1/3 I 57 100
78 Number Sequence — Part 5 I 57 100
79 Multilingual Monoalphabetic Substitution I 57 100
80 Turing Bombe Enigma I I 55 100
81 Enigma Messages with Repeated Letters — Part 4 I 54 100
82 AES key — encoded in the machine readable zone of a European ePassport II 53 1093
83 Heartbleed — Part 2 I 53 100
84 Recycled One-Time Pad I 49 100
85 An Invisible Message I 48 100
86 Monoalphabetic substitution with camouflage — Part 1 I 47 100
87 Unusual encryption using a diophantine equation II 47 1092
88 Kaskade-S/T — Part 2 II 44 1090
89 Number Sequence — Part 7 I 42 100
90 Keyshanc — Part 1 II 40 1095
91 ORYX Stream Cipher Part II II 40 1089
92 Number Sequence — Part 9 I 39 100
93 New Year's Greetings — Part 1 I 39 100
94 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 38 1090
95 Strange Message from Thessaloniki I 38 100
96 Unconcealed RSA messages II 37 1093
97 Monoalphabetic substitution with camouflage — Part 4 I 37 100
98 News from Castle Mansfeld I 37 100
99 Monoalphabetic substitution with camouflage — Part 2 II 36 1093
100 Music Code — Part 2 II 36 1091
101 Music Code — Part 1 I 36 100
102 Weakened Granit — Part 1 I 35 100
103 New Year's Greetings — Part 2 I 35 100
104 M-138 — Part 3 II 35 1111
105 Ku Klux Klan X 34 var
106 Pigpen with a twist — Part 2 II 34 1092
107 Monoalphabetic substitution with camouflage — Part 3 II 34 1093
108 New Year's Greetings — Part 3 I 34 100
109 An 'unhearable' message I 34 100
110 New Year's Greetings — Part 4 I 33 100
111 RSA Factoring Challenge: RSA-704 II 33 0
112 Double Column Transposition — Part 4 II 33 1106
113 Double Column Transposition — Part 2 II 33 1105
114 CMEA 1 II 33 1089
115 Keyshanc — Part 2 II 32 1095
116 Pigpen with a twist — Part 3 II 30 1092
117 Not-so-Secret Message from Malawi — Part II (ECC) II 30 1089
118 Number Sequence — Part 10 I 30 102
119 Double Column Transposition — Part 3 II 29 1105
120 The Einstein Enigma II 29 1212
121 Kaskade-S/T — Part 3 II 28 1090
122 Heartbleed — Part 3 II 28 1108
123 ORYX Stream Cipher — Part 3 (revised) II 26 1100
124 RSA Factoring Challenge: RSA-210 II 25 0
125 Advent-Challenge — Part 2 II 25 1192
126 Monoalphabetic Substitution with Camouflage — Part 5 II 22 1094
127 Lattice Part 1 II 22 1090
128 CMEA 2 III 21 13205
129 Double Column Transposition — Part 1 II 20 1105
130 Typex — Part 1 II 20 1098
131 RSA with Special d III 19 13197
132 Spanish Strip Cipher — Part 1 II 19 1105
133 Advent Challenge — Part 4 II 19 1193
134 Advent Challenge — Part 3 II 18 1193
135 Typex — Part 2 II 17 1099
136 Spanish Strip Cipher — Part 2 II 17 1105
137 Concealed Messages — Vigenère's Night Sky X 15 var
138 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 14 1130
139 Purple 1 II 14 1089
140 New Year's Greetings — Part 5 II 12 1125
141 M-138 — Part 4 II 12 1111
142 RSA Factoring Challenge: RSA-220 II 11 0
143 Flawed Usage of a OTP Cipher by the BND II 11 1117
144 Sigaba Part 1 II 11 1089
145 Weakened Handycipher — Part 1 II 10 1114
146 Cascading Encryption — Part 2/3 II 10 1099
147 AES ECB Wrong Encoding II 10 1192
148 ORYX Stream Cipher — Part 4a II 10 1105
149 Weakened Handycipher — Part 3 II 10 1114
150 Cascading Encryption — Part 3/3 II 10 1099
151 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 9 1091
152 Weakened Handycipher — Part 2 II 9 1114
153 Kaskade-S/T — Part 5 II 9 1091
154 Summer Job II 8 1523
155 Fastest in the West II 8 1523
156 Akelarre Part 1 II 7 1089
157 Trendy Messenger II 6 1523
158 Double Column Transposition — Part 5 II 5 1106
159 Handycipher — Part 3 III 5 13580
160 Handycipher — Part 2 II 5 1112
161 Handycipher — Part 6 III 4 13840
162 Handycipher — Part 5 III 4 13840
163 Handycipher — Part 1 II 4 1112
164 Notes of an Italian Soldier X 4 var
165 Weakened Handycipher — Part 4 II 4 1130
166 Weakened Handycipher — Part 5 II 4 1130
167 Weakened Handycipher — Part 6 II 4 1130
168 Sigaba Part 2 III 3 13197
169 The Vatikan Challenge — Part 2 X 3 var
170 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 3 1159
171 Spirale — Part 1 II 3 1117
172 Handycipher — Part 4 III 3 13840
173 Spirale — Part 2 II 3 1117
174 Holographic Encryption — Part 1 II 3 1149
175 Spirale — Part 3 II 3 1117
176 Holographic Encryption — Part 2 II 2 1149
177 Unknown Author X 2 var
178 Extended Handycipher — Part 3 II 2 1113
179 Extended Handycipher — Part 2 II 2 1113
180 Handycipher — Part 9 III 2 14025
181 Handycipher — Part 8 III 2 14025
182 Extended Handycipher — Part 4 III 2 13840
183 Extended Handycipher — Part 5 III 2 13840
184 Double Column Transposition X 2 var
185 Extended Handycipher — Part 1 II 2 1113
186 Weakened ElsieFour — Part 3 II 2 1174
187 The Vatican Challenge — Part 1 X 2 var
188 ORYX Stream Cipher — Part 4b III 2 13467
189 ElsieFour — Part 1 III 1 14434
190 Substitution Cipher with Non-Prefix Codes III 1 13235
191 Hilly — Part 1 II 1 1143
192 Handycipher — Part 7 III 1 14025
193 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1130
194 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1095
195 Extended Handycipher — Part 6 III 1 13840
196 Beale Ciphers X 1 var
197 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1130
198 RSA Factoring Challenge: RSA-1536 III 0 13277
199 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1130
200 Double Column Transposition Reloaded — Part 3 III 0 13431
201 World Record Challenge: Break 65 Bits of AES III 0 13197
202 Kryptos X 0 var
203 The third ENIGMA M4 message X 0 var
204 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1130
205 Twelve-Year-Old Murder Case X 0 var
206 Double Column Transposition Reloaded — Part 2 III 0 13431
207 Double Column Transposition Reloaded — Part 1 III 0 13431
208 RSA Factoring Challenge: RSA-480 III 0 13277
209 RSA Factoring Challenge: RSA-260 III 0 13277
210 Hilly — Part 2 II 0 1176
211 RSA Factoring Challenge: RSA-460 III 0 13277
212 RSA Factoring Challenge: RSA-250 III 0 13277
213 RSA Factoring Challenge: RSA-240 III 0 13277
214 RSA Factoring Challenge: RSA-230 II 0 1094
215 ORYX Stream Cipher — Part 4d III 0 13386
216 RSA Factoring Challenge: RSA-232 III 0 13277
217 Weakened ElsieFour — Part 1 II 0 1281
218 Kaskade-S/T — Part 4 II 0 1091
219 RSA Factoring Challenge: RSA-450 III 0 13277
220 Weakened ElsieFour — Part 2 II 0 1281
221 RSA Factoring Challenge: RSA-896 III 0 13277
222 RSA Factoring Challenge: RSA-400 III 0 13277
223 RSA Factoring Challenge: RSA-490 III 0 13277
224 RSA Factoring Challenge: RSA-320 III 0 13277
225 Spanish Strip Cipher — Part 3 X 0 var
226 RSA Factoring Challenge: RSA-410 III 0 13277
227 RSA Factoring Challenge: RSA-500 III 0 13277
228 RSA Factoring Challenge: RSA-1024 III 0 13277
229 RSA Factoring Challenge: RSA-310 III 0 13277
230 RSA Factoring Challenge: RSA-330 III 0 13277
231 Dorabella X 0 var
232 RSA Factoring Challenge: RSA-370 III 0 13277
233 RSA Factoring Challenge: RSA-380 III 0 13277
234 RSA Factoring Challenge: RSA-390 III 0 13277
235 RSA Factoring Challenge: RSA-360 III 0 13277
236 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13211
237 RSA Factoring Challenge: RSA-340 III 0 13277
238 RSA Factoring Challenge: RSA-350 III 0 13277
239 RSA Factoring Challenge: RSA-617 III 0 13277
240 Double-Column Transposition/Granit — Part 1 II 0 1116
241 RSA Factoring Challenge: RSA-300 III 0 13277
242 Weakened Granit — Part 3 II 0 1118
243 Weakened Granit — Part 2 II 0 1118
244 RSA Factoring Challenge: RSA-290 III 0 13277
245 RSA Factoring Challenge: RSA-280 III 0 13277
246 RSA Factoring Challenge: RSA-2048 III 0 13277
247 RSA Factoring Challenge: RSA-270 III 0 13277
248 ORYX Stream Cipher — Part 4c III 0 13467
249 RSA Factoring Challenge: RSA-309 III 0 13277
250 Digital Signatures: DSA with Medium Fields III 0 13249
251 D'Agapeyeff X 0 var
252 Double-Column Transposition/Granit — Part 3 II 0 1116
253 Double-Column Transposition/Granit — Part 2 II 0 1116
254 RSA Factoring Challenge: RSA-420 III 0 13277
255 RSA Factoring Challenge: RSA-430 III 0 13277
256 Spirale — Part 4 II 0 1117
257 RSA Factoring Challenge: RSA-470 III 0 13277
258 RSA Factoring Challenge: RSA-440 III 0 13277
 
 
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   +++    [19:26 - 19.06.2018] Theofanidis solved the Level II challenge 'Trendy Messenger'    +++    [16:36 - 19.06.2018] bogdan_walle solved the Level II challenge 'Fastest in the West'    +++    [07:44 - 19.06.2018] vexilla72 solved the Level II challenge 'Trendy Messenger'    +++    [07:37 - 19.06.2018] ExAmateur solved the Level I challenge 'Number Sequence — Part 9'    +++    [01:35 - 19.06.2018] ExAstris solved the Level II challenge 'M-138 — Part 3'    +++