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 2880 100
2 Original Caesar Cipher I 1877 100
3 Number Sequence — Part 2 I 1319 100
4 Caesar Encryption I 969 100
5 Beaver Code I 720 100
6 Letter to the Templars — Part 1 I 654 100
7 Number Sequence — Part 3 I 602 100
8 Letter to the Templars — Part 2 I 524 100
9 Number Sequence — Part 4 I 485 100
10 A hidden word I 462 100
11 Monoalphabetic Substitution I 425 100
12 Letter to the Templars — Part 3 II 408 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 314 100
16 Homophonic Encryption Part 1 I 294 100
17 Cracking SHA1-Hashed Passwords II 282 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 216 100
21 Alice's Birthday Party (Part 1) II 187 1093
22 Alice's Birthday Party (Part 2) II 179 1093
23 From Russia with Love I 176 100
24 Reserve Hand Procedure — Part 1 I 152 100
25 How do you become a big cryptographer? I 152 100
26 Modified Caesar Cipher I 151 100
27 Broadcasting and low exponent — RSA-Attack II 140 1097
28 Letter from the Alleged Countess Julie von Ortenburg I 137 100
29 Classical Ciphers^3 I 134 100
30 Not-so-Secret Message from Malawi — Part I (RSA) II 132 1093
31 Enigma Messages with Repeated Letters — Part 1 I 129 100
32 Number Sequence — Part 8 I 129 100
33 Brute-Force-Attack on Triple-DES with Reduced Key Space II 120 1093
34 M-138 — Part 1 I 118 100
35 Hybrid Encryption I II 113 1093
36 Pigpen with a twist — Part 1 I 113 100
37 Nils away on travel I 112 100
38 The Book Code: A Challenge for Bookworms I 109 100
39 RSA: Two different keys — same ciphertext II 108 1097
40 Molehunt (Part 1/3) I 105 100
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 101 100
45 ¿No Hablas Español? No problemo! I 92 100
46 Trifid Cipher I 91 100
47 A really long number sequence II 89 1097
48 ADFGVX — Part 2 I 84 100
49 Kaskade-S/T — Part 1 I 83 100
50 Enigma Combinatorics I 78 100
51 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 75 100
52 ADFGVX — Part 1 I 74 100
53 Heartbleed — Part 1 I 74 100
54 Double Columnar Transposition I 73 100
55 Playfair Encryption I 71 100
56 Playfair with hints about the grid I 69 100
57 ECDH-Key Exchange for Beginners I 69 100
58 M-138 — Part 2 II 69 1125
59 ORYX Stream Cipher Part I II 68 1093
60 Enigma Part 2 II 66 1093
61 Factorization Cipher — Part 3 II 65 1099
62 Number Sequence — Part 6 I 64 100
63 Zodiac Cipher I 64 100
64 Molehunt (Part 3/3) II 60 1093
65 A hidden word — Part 2 I 58 100
66 The Last Note I 58 100
67 Enigma Messages with Repeated Letters — Part 3 I 58 100
68 Enigma Messages with Repeated Letters — Part 2 I 58 100
69 Partial Key Exposure with RSA — Part 1 II 56 1099
70 Hill Cipher with Sudoku Key I 56 100
71 Smartcard RSA II 55 1093
72 Enigma Messages with Repeated Letters — Part 5 I 54 100
73 Number Sequence — Part 5 I 54 100
74 Enigma Messages I 51 100
75 Cascading Encryption — Part 1/3 I 51 100
76 BCR code (Book-Caesar-RSA) II 51 1103
77 Turing Bombe Enigma I I 51 100
78 Enigma Messages with Repeated Letters — Part 4 I 50 100
79 Heartbleed — Part 2 I 50 100
80 Image Noise I 49 100
81 Multilingual Monoalphabetic Substitution I 48 100
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 44 100
85 Monoalphabetic substitution with camouflage — Part 1 I 41 100
86 Kaskade-S/T — Part 2 II 40 1095
87 Unusual encryption using a diophantine equation II 40 1097
88 ORYX Stream Cipher Part II II 37 1093
89 Keyshanc — Part 1 II 36 1101
90 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 35 1094
91 Music Code — Part 2 II 34 1096
92 Music Code — Part 1 I 34 100
93 Monoalphabetic substitution with camouflage — Part 4 I 34 100
94 Strange Message from Thessaloniki I 34 100
95 News from Castle Mansfeld I 33 100
96 Number Sequence — Part 7 I 33 100
97 Monoalphabetic substitution with camouflage — Part 2 II 33 1098
98 Unconcealed RSA messages II 33 1098
99 Ku Klux Klan X 32 var
100 An 'unhearable' message I 31 100
101 Pigpen with a twist — Part 2 II 31 1097
102 CMEA 1 II 31 1094
103 Monoalphabetic substitution with camouflage — Part 3 II 31 1098
104 Weakened Granit — Part 1 I 30 100
105 M-138 — Part 3 II 30 1125
106 New Year's Greetings — Part 1 I 30 100
107 Double Column Transposition — Part 2 II 29 1116
108 Double Column Transposition — Part 4 II 29 1117
109 RSA Factoring Challenge: RSA-704 II 28 0
110 Keyshanc — Part 2 II 28 1101
111 New Year's Greetings — Part 2 I 26 100
112 Not-so-Secret Message from Malawi — Part II (ECC) II 26 1093
113 Pigpen with a twist — Part 3 II 26 1097
114 New Year's Greetings — Part 3 I 25 100
115 Double Column Transposition — Part 3 II 25 1116
116 Heartbleed — Part 3 II 24 1120
117 New Year's Greetings — Part 4 I 24 100
118 Kaskade-S/T — Part 3 II 23 1095
119 ORYX Stream Cipher — Part 3 (revised) II 23 1108
120 RSA Factoring Challenge: RSA-210 II 21 0
121 CMEA 2 III 20 13281
122 Double Column Transposition — Part 1 II 19 1115
123 Typex — Part 1 II 19 1106
124 Monoalphabetic Substitution with Camouflage — Part 5 II 19 1100
125 Lattice Part 1 II 18 1095
126 Spanish Strip Cipher — Part 1 II 18 1115
127 Typex — Part 2 II 16 1106
128 RSA with Special d III 16 13271
129 Spanish Strip Cipher — Part 2 II 15 1115
130 Concealed Messages — Vigenère's Night Sky X 15 var
131 Purple 1 II 12 1093
132 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 11 1173
133 New Year's Greetings — Part 5 II 11 1156
134 Cascading Encryption — Part 2/3 II 10 1106
135 Cascading Encryption — Part 3/3 II 10 1106
136 Sigaba Part 1 II 10 1093
137 Flawed Usage of a OTP Cipher by the BND II 9 1137
138 Kaskade-S/T — Part 5 II 8 1096
139 Weakened Handycipher — Part 1 II 8 1131
140 Weakened Handycipher — Part 3 II 8 1131
141 ORYX Stream Cipher — Part 4a II 8 1116
142 M-138 — Part 4 II 8 1125
143 Akelarre Part 1 II 7 1094
144 Weakened Handycipher — Part 2 II 7 1131
145 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 7 1095
146 Double Column Transposition — Part 5 II 5 1118
147 RSA Factoring Challenge: RSA-220 II 4 0
148 Notes of an Italian Soldier X 4 var
149 Handycipher — Part 2 II 3 1128
150 Handycipher — Part 3 III 3 13814
151 Handycipher — Part 1 II 2 1128
152 Handycipher — Part 6 III 2 14398
153 Weakened Handycipher — Part 5 II 2 1171
154 Spirale — Part 1 II 2 1137
155 Spirale — Part 2 II 2 1137
156 Spirale — Part 3 II 2 1137
157 Weakened Handycipher — Part 4 II 2 1171
158 Unknown Author X 2 var
159 Double Column Transposition X 2 var
160 Weakened Handycipher — Part 6 II 2 1171
161 Sigaba Part 2 III 2 13271
162 Handycipher — Part 5 III 2 14398
163 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1101
164 ORYX Stream Cipher — Part 4b III 1 13633
165 Hilly — Part 1 II 1 1265
166 Beale Ciphers X 1 var
167 Substitution Cipher with Non-Prefix Codes III 1 13319
168 Extended Handycipher — Part 4 III 1 14398
169 Extended Handycipher — Part 5 III 1 14398
170 Extended Handycipher — Part 1 II 1 1129
171 Extended Handycipher — Part 3 II 1 1129
172 Handycipher — Part 4 III 1 14398
173 Extended Handycipher — Part 2 II 1 1129
174 Handycipher — Part 7 III 0 15406
175 Double-Column Transposition/Granit — Part 1 II 0 1134
176 Handycipher — Part 8 III 0 15406
177 Handycipher — Part 9 III 0 15406
178 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1173
179 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1173
180 Weakened Granit — Part 2 II 0 1140
181 Weakened Granit — Part 3 II 0 1140
182 Extended Handycipher — Part 6 III 0 14398
183 Spirale — Part 4 II 0 1137
184 Double-Column Transposition/Granit — Part 3 II 0 1134
185 Double-Column Transposition/Granit — Part 2 II 0 1134
186 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 0 1173
187 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1173
188 RSA Factoring Challenge: RSA-490 III 0 13372
189 RSA Factoring Challenge: RSA-896 III 0 13372
190 RSA Factoring Challenge: RSA-280 III 0 13372
191 RSA Factoring Challenge: RSA-270 III 0 13372
192 RSA Factoring Challenge: RSA-260 III 0 13372
193 RSA Factoring Challenge: RSA-250 III 0 13372
194 RSA Factoring Challenge: RSA-290 III 0 13372
195 RSA Factoring Challenge: RSA-300 III 0 13372
196 RSA Factoring Challenge: RSA-320 III 0 13372
197 RSA Factoring Challenge: RSA-310 III 0 13372
198 RSA Factoring Challenge: RSA-1024 III 0 13372
199 RSA Factoring Challenge: RSA-309 III 0 13372
200 RSA Factoring Challenge: RSA-240 III 0 13372
201 RSA Factoring Challenge: RSA-232 III 0 13372
202 World Record Challenge: Break 65 Bits of AES III 0 13271
203 Kryptos X 0 var
204 Dorabella X 0 var
205 D'Agapeyeff X 0 var
206 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13288
207 Twelve-Year-Old Murder Case X 0 var
208 RSA Factoring Challenge: RSA-230 II 0 1099
209 The third ENIGMA M4 message X 0 var
210 Digital Signatures: DSA with Medium Fields III 0 13336
211 Kaskade-S/T — Part 4 II 0 1096
212 RSA Factoring Challenge: RSA-330 III 0 13372
213 RSA Factoring Challenge: RSA-340 III 0 13372
214 RSA Factoring Challenge: RSA-500 III 0 13372
215 RSA Factoring Challenge: RSA-617 III 0 13372
216 RSA Factoring Challenge: RSA-480 III 0 13372
217 RSA Factoring Challenge: RSA-470 III 0 13372
218 RSA Factoring Challenge: RSA-1536 III 0 13372
219 RSA Factoring Challenge: RSA-2048 III 0 13372
220 ORYX Stream Cipher — Part 4d III 0 13517
221 Spanish Strip Cipher — Part 3 X 0 var
222 Double Column Transposition Reloaded — Part 3 III 0 13579
223 Double Column Transposition Reloaded — Part 2 III 0 13579
224 Double Column Transposition Reloaded — Part 1 III 0 13579
225 RSA Factoring Challenge: RSA-460 III 0 13372
226 RSA Factoring Challenge: RSA-450 III 0 13372
227 RSA Factoring Challenge: RSA-380 III 0 13372
228 RSA Factoring Challenge: RSA-370 III 0 13372
229 RSA Factoring Challenge: RSA-360 III 0 13372
230 RSA Factoring Challenge: RSA-350 III 0 13372
231 RSA Factoring Challenge: RSA-390 III 0 13372
232 RSA Factoring Challenge: RSA-400 III 0 13372
233 RSA Factoring Challenge: RSA-440 III 0 13372
234 RSA Factoring Challenge: RSA-430 III 0 13372
235 RSA Factoring Challenge: RSA-420 III 0 13372
236 RSA Factoring Challenge: RSA-410 III 0 13372
237 ORYX Stream Cipher — Part 4c III 0 13633
 
 
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   +++    [23:45 - 29.03.2017] c2 solved the Level I challenge 'Classical Ciphers^3'    +++    [23:05 - 29.03.2017] c2 solved the Level II challenge 'Lunchtime Attack on the Fully Homomorphic Encryption Scheme'    +++    [18:20 - 29.03.2017] indojab solved the Level I challenge 'Original Caesar Cipher'    +++    [17:17 - 29.03.2017] indojab solved the Level I challenge 'Number Sequence'    +++    [16:05 - 29.03.2017] Sgt. Pepper solved the Level I challenge 'A Secret Message from Castle Mansfeld'    +++