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 2898 100
2 Original Caesar Cipher I 1894 100
3 Number Sequence — Part 2 I 1327 100
4 Caesar Encryption I 976 100
5 Beaver Code I 728 100
6 Letter to the Templars — Part 1 I 657 100
7 Number Sequence — Part 3 I 604 100
8 Letter to the Templars — Part 2 I 527 100
9 Number Sequence — Part 4 I 485 100
10 A hidden word I 466 100
11 Monoalphabetic Substitution I 426 100
12 Letter to the Templars — Part 3 II 410 1103
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 378 100
14 Factorization Cipher — Part 1 I 336 100
15 Grille Cipher I 315 100
16 Homophonic Encryption Part 1 I 296 100
17 Cracking SHA1-Hashed Passwords II 284 1095
18 Homophonic Encryption Part 2 I 255 100
19 One-Time Pad with Flaws I 229 100
20 Snow White and the seven dwarfs I 217 100
21 Alice's Birthday Party (Part 1) II 189 1093
22 Alice's Birthday Party (Part 2) II 180 1093
23 From Russia with Love I 177 100
24 Modified Caesar Cipher I 153 100
25 How do you become a big cryptographer? I 152 100
26 Reserve Hand Procedure — Part 1 I 152 100
27 Broadcasting and low exponent — RSA-Attack II 140 1096
28 Letter from the Alleged Countess Julie von Ortenburg I 138 100
29 Classical Ciphers^3 I 135 100
30 Not-so-Secret Message from Malawi — Part I (RSA) II 132 1093
31 Number Sequence — Part 8 I 132 100
32 Enigma Messages with Repeated Letters — Part 1 I 129 100
33 Brute-Force-Attack on Triple-DES with Reduced Key Space II 120 1093
34 M-138 — Part 1 I 119 100
35 Nils away on travel I 116 100
36 Pigpen with a twist — Part 1 I 114 100
37 Hybrid Encryption I II 113 1093
38 The Book Code: A Challenge for Bookworms I 110 100
39 RSA: Two different keys — same ciphertext II 108 1097
40 Molehunt (Part 1/3) I 106 100
41 Enigma Part 1 II 105 1093
42 Factorization Cipher — Part 2 II 103 1098
43 A Secret Message from Castle Mansfeld I 102 100
44 Molehunt (Part 2/3) I 102 100
45 ¿No Hablas Español? No problemo! I 93 100
46 Trifid Cipher I 91 100
47 A really long number sequence II 89 1097
48 ADFGVX — Part 2 I 85 100
49 Kaskade-S/T — Part 1 I 85 100
50 Enigma Combinatorics I 78 100
51 ADFGVX — Part 1 I 75 100
52 Heartbleed — Part 1 I 75 100
53 Double Columnar Transposition I 75 100
54 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 75 100
55 Playfair Encryption I 72 100
56 Playfair with hints about the grid I 70 100
57 M-138 — Part 2 II 69 1124
58 ECDH-Key Exchange for Beginners I 69 100
59 ORYX Stream Cipher Part I II 68 1093
60 Enigma Part 2 II 67 1093
61 Zodiac Cipher I 66 100
62 Factorization Cipher — Part 3 II 65 1098
63 Number Sequence — Part 6 I 64 100
64 Molehunt (Part 3/3) II 61 1093
65 A hidden word — Part 2 I 59 100
66 Enigma Messages with Repeated Letters — Part 3 I 58 100
67 Hill Cipher with Sudoku Key I 58 100
68 The Last Note I 58 100
69 Enigma Messages with Repeated Letters — Part 2 I 58 100
70 Partial Key Exposure with RSA — Part 1 II 57 1099
71 Smartcard RSA II 56 1093
72 Number Sequence — Part 5 I 54 100
73 Enigma Messages with Repeated Letters — Part 5 I 54 100
74 Cascading Encryption — Part 1/3 I 52 100
75 Turing Bombe Enigma I I 52 100
76 BCR code (Book-Caesar-RSA) II 52 1102
77 Image Noise I 51 100
78 Enigma Messages I 51 100
79 Enigma Messages with Repeated Letters — Part 4 I 50 100
80 Heartbleed — Part 2 I 50 100
81 Multilingual Monoalphabetic Substitution I 49 100
82 AES key — encoded in the machine readable zone of a European ePassport II 46 1099
83 Recycled One-Time Pad I 45 100
84 An Invisible Message I 45 100
85 Kaskade-S/T — Part 2 II 42 1095
86 Monoalphabetic substitution with camouflage — Part 1 I 41 100
87 Unusual encryption using a diophantine equation II 40 1097
88 Keyshanc — Part 1 II 37 1100
89 ORYX Stream Cipher Part II II 37 1093
90 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 36 1094
91 News from Castle Mansfeld I 35 100
92 Strange Message from Thessaloniki I 35 100
93 Monoalphabetic substitution with camouflage — Part 4 I 35 100
94 Unconcealed RSA messages II 34 1098
95 Music Code — Part 2 II 34 1095
96 Music Code — Part 1 I 34 100
97 Number Sequence — Part 7 I 33 100
98 Monoalphabetic substitution with camouflage — Part 2 II 33 1098
99 An 'unhearable' message I 32 100
100 Ku Klux Klan X 32 var
101 Monoalphabetic substitution with camouflage — Part 3 II 31 1098
102 Weakened Granit — Part 1 I 31 100
103 Pigpen with a twist — Part 2 II 31 1097
104 CMEA 1 II 31 1094
105 New Year's Greetings — Part 1 I 30 100
106 M-138 — Part 3 II 30 1124
107 Double Column Transposition — Part 2 II 29 1115
108 Keyshanc — Part 2 II 29 1100
109 Double Column Transposition — Part 4 II 29 1116
110 RSA Factoring Challenge: RSA-704 II 28 0
111 Pigpen with a twist — Part 3 II 27 1097
112 Not-so-Secret Message from Malawi — Part II (ECC) II 26 1093
113 New Year's Greetings — Part 2 I 26 100
114 Heartbleed — Part 3 II 25 1119
115 Double Column Transposition — Part 3 II 25 1115
116 New Year's Greetings — Part 3 I 25 100
117 Kaskade-S/T — Part 3 II 24 1095
118 New Year's Greetings — Part 4 I 24 100
119 ORYX Stream Cipher — Part 3 (revised) II 23 1107
120 RSA Factoring Challenge: RSA-210 II 21 0
121 CMEA 2 III 20 13276
122 Typex — Part 1 II 19 1105
123 Double Column Transposition — Part 1 II 19 1115
124 Monoalphabetic Substitution with Camouflage — Part 5 II 19 1099
125 Spanish Strip Cipher — Part 1 II 18 1114
126 Lattice Part 1 II 18 1095
127 RSA with Special d III 16 13266
128 Typex — Part 2 II 16 1106
129 Concealed Messages — Vigenère's Night Sky X 15 var
130 Spanish Strip Cipher — Part 2 II 15 1114
131 Purple 1 II 13 1093
132 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 11 1169
133 New Year's Greetings — Part 5 II 11 1153
134 Cascading Encryption — Part 3/3 II 10 1106
135 Cascading Encryption — Part 2/3 II 10 1106
136 Sigaba Part 1 II 10 1093
137 Flawed Usage of a OTP Cipher by the BND II 9 1136
138 Kaskade-S/T — Part 5 II 9 1095
139 Weakened Handycipher — Part 1 II 8 1130
140 Weakened Handycipher — Part 3 II 8 1130
141 ORYX Stream Cipher — Part 4a II 8 1115
142 M-138 — Part 4 II 8 1124
143 Weakened Handycipher — Part 2 II 7 1130
144 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 7 1095
145 Akelarre Part 1 II 7 1093
146 Double Column Transposition — Part 5 II 5 1117
147 RSA Factoring Challenge: RSA-220 II 4 0
148 Notes of an Italian Soldier X 4 var
149 Handycipher — Part 2 II 3 1127
150 Handycipher — Part 3 III 3 13797
151 Spirale — Part 1 II 2 1136
152 Weakened Handycipher — Part 6 II 2 1167
153 Handycipher — Part 1 II 2 1127
154 Double Column Transposition X 2 var
155 Holographic Encryption — Part 1 II 2 1414
156 Sigaba Part 2 III 2 13266
157 Holographic Encryption — Part 2 II 2 1414
158 Handycipher — Part 5 III 2 14346
159 Handycipher — Part 6 III 2 14346
160 Spirale — Part 2 II 2 1136
161 Spirale — Part 3 II 2 1136
162 Weakened Handycipher — Part 5 II 2 1167
163 Weakened Handycipher — Part 4 II 2 1167
164 Unknown Author X 2 var
165 ORYX Stream Cipher — Part 4b III 1 13622
166 Extended Handycipher — Part 4 III 1 14346
167 Extended Handycipher — Part 1 II 1 1128
168 Substitution Cipher with Non-Prefix Codes III 1 13314
169 Beale Ciphers X 1 var
170 Hilly — Part 1 II 1 1239
171 Handycipher — Part 4 III 1 14346
172 Extended Handycipher — Part 5 III 1 14346
173 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1101
174 Extended Handycipher — Part 3 II 1 1128
175 Extended Handycipher — Part 2 II 1 1128
176 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1169
177 Handycipher — Part 7 III 0 15165
178 Handycipher — Part 9 III 0 15165
179 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1169
180 Handycipher — Part 8 III 0 15165
181 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1169
182 Weakened Granit — Part 3 II 0 1138
183 Weakened Granit — Part 2 II 0 1138
184 Spirale — Part 4 II 0 1136
185 Double-Column Transposition/Granit — Part 2 II 0 1133
186 Double-Column Transposition/Granit — Part 1 II 0 1133
187 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 0 1169
188 Extended Handycipher — Part 6 III 0 14346
189 Double-Column Transposition/Granit — Part 3 II 0 1133
190 RSA Factoring Challenge: RSA-500 III 0 13366
191 RSA Factoring Challenge: RSA-896 III 0 13366
192 RSA Factoring Challenge: RSA-280 III 0 13366
193 RSA Factoring Challenge: RSA-270 III 0 13366
194 RSA Factoring Challenge: RSA-260 III 0 13366
195 RSA Factoring Challenge: RSA-250 III 0 13366
196 RSA Factoring Challenge: RSA-290 III 0 13366
197 RSA Factoring Challenge: RSA-300 III 0 13366
198 RSA Factoring Challenge: RSA-320 III 0 13366
199 RSA Factoring Challenge: RSA-310 III 0 13366
200 RSA Factoring Challenge: RSA-1024 III 0 13366
201 RSA Factoring Challenge: RSA-309 III 0 13366
202 RSA Factoring Challenge: RSA-240 III 0 13366
203 RSA Factoring Challenge: RSA-232 III 0 13366
204 World Record Challenge: Break 65 Bits of AES III 0 13266
205 Kryptos X 0 var
206 Dorabella X 0 var
207 D'Agapeyeff X 0 var
208 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13284
209 Twelve-Year-Old Murder Case X 0 var
210 RSA Factoring Challenge: RSA-230 II 0 1099
211 The third ENIGMA M4 message X 0 var
212 Digital Signatures: DSA with Medium Fields III 0 13330
213 Kaskade-S/T — Part 4 II 0 1095
214 RSA Factoring Challenge: RSA-330 III 0 13366
215 RSA Factoring Challenge: RSA-340 III 0 13366
216 RSA Factoring Challenge: RSA-490 III 0 13366
217 RSA Factoring Challenge: RSA-617 III 0 13366
218 RSA Factoring Challenge: RSA-480 III 0 13366
219 RSA Factoring Challenge: RSA-470 III 0 13366
220 RSA Factoring Challenge: RSA-1536 III 0 13366
221 RSA Factoring Challenge: RSA-2048 III 0 13366
222 ORYX Stream Cipher — Part 4d III 0 13509
223 Spanish Strip Cipher — Part 3 X 0 var
224 Double Column Transposition Reloaded — Part 3 III 0 13570
225 Double Column Transposition Reloaded — Part 2 III 0 13570
226 Double Column Transposition Reloaded — Part 1 III 0 13570
227 RSA Factoring Challenge: RSA-460 III 0 13366
228 RSA Factoring Challenge: RSA-450 III 0 13366
229 RSA Factoring Challenge: RSA-380 III 0 13366
230 RSA Factoring Challenge: RSA-370 III 0 13366
231 RSA Factoring Challenge: RSA-360 III 0 13366
232 RSA Factoring Challenge: RSA-350 III 0 13366
233 RSA Factoring Challenge: RSA-390 III 0 13366
234 RSA Factoring Challenge: RSA-400 III 0 13366
235 RSA Factoring Challenge: RSA-440 III 0 13366
236 RSA Factoring Challenge: RSA-430 III 0 13366
237 RSA Factoring Challenge: RSA-420 III 0 13366
238 RSA Factoring Challenge: RSA-410 III 0 13366
239 ORYX Stream Cipher — Part 4c III 0 13622
 
 
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   +++    [10:52 - 23.04.2017] silva solved the Level I challenge 'M-138 — Part 1'    +++    [06:05 - 23.04.2017] Bitelo solved the Level I challenge 'Hill Cipher with Sudoku Key'    +++    [00:43 - 23.04.2017] nataliaschults solved the Level I challenge '¿No Hablas Español? No problemo!'    +++    [23:40 - 22.04.2017] Lemmynator solved the Level I challenge 'ADFGVX — Part 1'    +++    [14:37 - 22.04.2017] Lemmynator solved the Level I challenge 'ADFGVX — Part 2'    +++