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 3035 100
2 Original Caesar Cipher I 1991 100
3 Number Sequence — Part 2 I 1396 100
4 Caesar Encryption I 1012 100
5 Beaver Code I 766 100
6 Letter to the Templars — Part 1 I 686 100
7 Number Sequence — Part 3 I 632 100
8 Letter to the Templars — Part 2 I 551 100
9 Number Sequence — Part 4 I 508 100
10 A hidden word I 492 100
11 Monoalphabetic Substitution I 439 100
12 Letter to the Templars — Part 3 II 433 1099
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 394 100
14 Factorization Cipher — Part 1 I 353 100
15 Grille Cipher I 325 100
16 Cracking SHA1-Hashed Passwords II 313 1093
17 Homophonic Encryption Part 1 I 309 100
18 Homophonic Encryption Part 2 I 264 100
19 One-Time Pad with Flaws I 236 100
20 Snow White and the seven dwarfs I 224 100
21 Alice's Birthday Party (Part 1) II 204 1091
22 Alice's Birthday Party (Part 2) II 195 1091
23 From Russia with Love I 184 100
24 Modified Caesar Cipher I 161 100
25 How do you become a big cryptographer? I 160 100
26 Broadcasting and low exponent — RSA-Attack II 157 1094
27 Reserve Hand Procedure — Part 1 I 155 100
28 Number Sequence — Part 8 I 153 100
29 Letter from the Alleged Countess Julie von Ortenburg I 144 100
30 Not-so-Secret Message from Malawi — Part I (RSA) II 140 1091
31 Classical Ciphers^3 I 138 100
32 Enigma Messages with Repeated Letters — Part 1 I 132 100
33 Brute-Force-Attack on Triple-DES with Reduced Key Space II 130 1091
34 M-138 — Part 1 I 125 100
35 Hybrid Encryption I II 120 1091
36 Nils away on travel I 118 100
37 Pigpen with a twist — Part 1 I 116 100
38 RSA: Two different keys — same ciphertext II 115 1094
39 The Book Code: A Challenge for Bookworms I 114 100
40 Enigma Part 1 II 111 1091
41 Factorization Cipher — Part 2 II 108 1095
42 Molehunt (Part 1/3) I 107 100
43 A Secret Message from Castle Mansfeld I 105 100
44 Molehunt (Part 2/3) I 103 100
45 ¿No Hablas Español? No problemo! I 97 100
46 Trifid Cipher I 94 100
47 A really long number sequence II 92 1094
48 ADFGVX — Part 2 I 91 100
49 Kaskade-S/T — Part 1 I 89 100
50 Enigma Combinatorics I 83 100
51 Heartbleed — Part 1 I 82 100
52 ADFGVX — Part 1 I 81 100
53 Double Columnar Transposition I 79 100
54 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 79 100
55 Playfair Encryption I 78 100
56 Playfair with hints about the grid I 75 100
57 M-138 — Part 2 II 74 1116
58 ECDH-Key Exchange for Beginners I 74 100
59 Number Sequence — Part 6 I 73 100
60 ORYX Stream Cipher Part I II 72 1091
61 Enigma Part 2 II 70 1091
62 Zodiac Cipher I 70 100
63 Factorization Cipher — Part 3 II 69 1096
64 Image Noise I 66 100
65 A hidden word — Part 2 I 63 100
66 The Last Note I 63 100
67 Hill Cipher with Sudoku Key I 62 100
68 Enigma Messages with Repeated Letters — Part 2 I 62 100
69 Molehunt (Part 3/3) II 62 1091
70 Enigma Messages with Repeated Letters — Part 3 I 61 100
71 Partial Key Exposure with RSA — Part 1 II 60 1096
72 Smartcard RSA II 58 1091
73 BCR code (Book-Caesar-RSA) II 58 1099
74 Enigma Messages with Repeated Letters — Part 5 I 57 100
75 Enigma Messages I 57 100
76 Number Sequence — Part 5 I 56 100
77 Turing Bombe Enigma I I 55 100
78 Multilingual Monoalphabetic Substitution I 54 100
79 Cascading Encryption — Part 1/3 I 54 100
80 Heartbleed — Part 2 I 53 100
81 AES key — encoded in the machine readable zone of a European ePassport II 53 1096
82 Enigma Messages with Repeated Letters — Part 4 I 53 100
83 Unusual encryption using a diophantine equation II 46 1094
84 Recycled One-Time Pad I 46 100
85 An Invisible Message I 45 100
86 Kaskade-S/T — Part 2 II 44 1092
87 Monoalphabetic substitution with camouflage — Part 1 I 44 100
88 ORYX Stream Cipher Part II II 40 1091
89 Keyshanc — Part 1 II 40 1097
90 Number Sequence — Part 7 I 38 100
91 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 38 1092
92 Strange Message from Thessaloniki I 37 100
93 Monoalphabetic substitution with camouflage — Part 4 I 37 100
94 Unconcealed RSA messages II 36 1095
95 News from Castle Mansfeld I 36 100
96 Music Code — Part 1 I 35 100
97 Music Code — Part 2 II 35 1093
98 Monoalphabetic substitution with camouflage — Part 2 II 35 1095
99 Weakened Granit — Part 1 I 35 100
100 Ku Klux Klan X 34 var
101 CMEA 1 II 33 1091
102 An 'unhearable' message I 33 100
103 Pigpen with a twist — Part 2 II 33 1094
104 Monoalphabetic substitution with camouflage — Part 3 II 33 1095
105 Keyshanc — Part 2 II 32 1097
106 New Year's Greetings — Part 1 I 32 100
107 Double Column Transposition — Part 2 II 32 1110
108 Double Column Transposition — Part 4 II 31 1110
109 RSA Factoring Challenge: RSA-704 II 31 0
110 M-138 — Part 3 II 31 1116
111 Not-so-Secret Message from Malawi — Part II (ECC) II 29 1091
112 Pigpen with a twist — Part 3 II 29 1094
113 New Year's Greetings — Part 2 I 28 100
114 Double Column Transposition — Part 3 II 28 1110
115 Heartbleed — Part 3 II 28 1113
116 New Year's Greetings — Part 3 I 27 100
117 Kaskade-S/T — Part 3 II 27 1092
118 ORYX Stream Cipher — Part 3 (revised) II 26 1103
119 New Year's Greetings — Part 4 I 26 100
120 RSA Factoring Challenge: RSA-210 II 23 0
121 CMEA 2 III 21 13239
122 Monoalphabetic Substitution with Camouflage — Part 5 II 21 1097
123 Typex — Part 1 II 20 1102
124 Double Column Transposition — Part 1 II 20 1109
125 Spanish Strip Cipher — Part 1 II 19 1109
126 RSA with Special d III 18 13230
127 Lattice Part 1 II 18 1092
128 Typex — Part 2 II 17 1102
129 Spanish Strip Cipher — Part 2 II 17 1109
130 Concealed Messages — Vigenère's Night Sky X 15 var
131 Purple 1 II 14 1091
132 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 13 1144
133 New Year's Greetings — Part 5 II 12 1136
134 M-138 — Part 4 II 11 1116
135 Sigaba Part 1 II 11 1091
136 ORYX Stream Cipher — Part 4a II 10 1110
137 Flawed Usage of a OTP Cipher by the BND II 10 1125
138 Cascading Encryption — Part 2/3 II 10 1102
139 Cascading Encryption — Part 3/3 II 10 1102
140 Kaskade-S/T — Part 5 II 9 1093
141 Weakened Handycipher — Part 1 II 9 1121
142 Weakened Handycipher — Part 3 II 9 1121
143 Weakened Handycipher — Part 2 II 8 1121
144 Number Sequence — Part 9 I 8 133
145 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 8 1093
146 RSA Factoring Challenge: RSA-220 II 7 0
147 Akelarre Part 1 II 7 1091
148 Double Column Transposition — Part 5 II 5 1111
149 Handycipher — Part 2 II 4 1118
150 Notes of an Italian Soldier X 4 var
151 Handycipher — Part 3 III 4 13676
152 Handycipher — Part 1 II 3 1118
153 Weakened Handycipher — Part 4 II 3 1143
154 Handycipher — Part 6 III 3 14031
155 Spirale — Part 3 II 3 1125
156 Holographic Encryption — Part 1 II 3 1181
157 Weakened Handycipher — Part 5 II 3 1143
158 Weakened Handycipher — Part 6 II 3 1143
159 Spirale — Part 2 II 3 1125
160 Handycipher — Part 5 III 3 14031
161 Spirale — Part 1 II 3 1125
162 Sigaba Part 2 III 3 13230
163 Extended Handycipher — Part 3 II 2 1119
164 Extended Handycipher — Part 2 II 2 1119
165 Extended Handycipher — Part 1 II 2 1119
166 Extended Handycipher — Part 5 III 2 14031
167 ORYX Stream Cipher — Part 4b III 2 13537
168 Double Column Transposition X 2 var
169 Extended Handycipher — Part 4 III 2 14031
170 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 2 1209
171 Unknown Author X 2 var
172 Holographic Encryption — Part 2 II 2 1181
173 Handycipher — Part 4 III 2 14031
174 Handycipher — Part 8 III 1 14340
175 Handycipher — Part 9 III 1 14340
176 Hilly — Part 1 II 1 1167
177 Substitution Cipher with Non-Prefix Codes III 1 13273
178 Beale Ciphers X 1 var
179 Handycipher — Part 7 III 1 14340
180 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1144
181 Extended Handycipher — Part 6 III 1 14031
182 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1098
183 Weakened ElsieFour — Part 1 II 0 1290
184 Double-Column Transposition/Granit — Part 3 II 0 1123
185 Double-Column Transposition/Granit — Part 2 II 0 1123
186 Double-Column Transposition/Granit — Part 1 II 0 1123
187 Spirale — Part 4 II 0 1125
188 Hilly — Part 2 II 0 1327
189 Weakened Granit — Part 2 II 0 1126
190 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1144
191 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1144
192 Weakened Granit — Part 3 II 0 1126
193 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1144
194 ElsieFour — Part 1 II 0 1290
195 RSA Factoring Challenge: RSA-2048 III 0 13319
196 RSA Factoring Challenge: RSA-896 III 0 13319
197 RSA Factoring Challenge: RSA-280 III 0 13319
198 RSA Factoring Challenge: RSA-270 III 0 13319
199 RSA Factoring Challenge: RSA-260 III 0 13319
200 RSA Factoring Challenge: RSA-250 III 0 13319
201 RSA Factoring Challenge: RSA-290 III 0 13319
202 RSA Factoring Challenge: RSA-300 III 0 13319
203 RSA Factoring Challenge: RSA-320 III 0 13319
204 RSA Factoring Challenge: RSA-310 III 0 13319
205 RSA Factoring Challenge: RSA-1024 III 0 13319
206 RSA Factoring Challenge: RSA-309 III 0 13319
207 RSA Factoring Challenge: RSA-240 III 0 13319
208 RSA Factoring Challenge: RSA-232 III 0 13319
209 World Record Challenge: Break 65 Bits of AES III 0 13230
210 Kryptos X 0 var
211 Dorabella X 0 var
212 D'Agapeyeff X 0 var
213 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13246
214 Twelve-Year-Old Murder Case X 0 var
215 RSA Factoring Challenge: RSA-230 II 0 1096
216 The third ENIGMA M4 message X 0 var
217 Digital Signatures: DSA with Medium Fields III 0 13288
218 Kaskade-S/T — Part 4 II 0 1093
219 RSA Factoring Challenge: RSA-330 III 0 13319
220 RSA Factoring Challenge: RSA-340 III 0 13319
221 RSA Factoring Challenge: RSA-490 III 0 13319
222 RSA Factoring Challenge: RSA-500 III 0 13319
223 RSA Factoring Challenge: RSA-480 III 0 13319
224 RSA Factoring Challenge: RSA-470 III 0 13319
225 RSA Factoring Challenge: RSA-1536 III 0 13319
226 RSA Factoring Challenge: RSA-617 III 0 13319
227 ORYX Stream Cipher — Part 4d III 0 13443
228 Spanish Strip Cipher — Part 3 X 0 var
229 Double Column Transposition Reloaded — Part 3 III 0 13495
230 Double Column Transposition Reloaded — Part 2 III 0 13495
231 Double Column Transposition Reloaded — Part 1 III 0 13495
232 RSA Factoring Challenge: RSA-460 III 0 13319
233 RSA Factoring Challenge: RSA-450 III 0 13319
234 RSA Factoring Challenge: RSA-380 III 0 13319
235 RSA Factoring Challenge: RSA-370 III 0 13319
236 RSA Factoring Challenge: RSA-360 III 0 13319
237 RSA Factoring Challenge: RSA-350 III 0 13319
238 RSA Factoring Challenge: RSA-390 III 0 13319
239 RSA Factoring Challenge: RSA-400 III 0 13319
240 RSA Factoring Challenge: RSA-440 III 0 13319
241 RSA Factoring Challenge: RSA-430 III 0 13319
242 RSA Factoring Challenge: RSA-420 III 0 13319
243 RSA Factoring Challenge: RSA-410 III 0 13319
244 ORYX Stream Cipher — Part 4c III 0 13537
 
 
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   +++    [21:11 - 18.11.2017] nimroth cynthor solved the Level I challenge 'Affine Codes / Modulo Arithmetic with N / Extended Euclid'    +++    [18:53 - 18.11.2017] nimroth cynthor solved the Level I challenge 'Factorization Cipher — Part 1'    +++    [17:45 - 18.11.2017] nimroth cynthor solved the Level I challenge 'Modified Caesar Cipher'    +++    [16:55 - 18.11.2017] rm solved the Level I challenge 'Number Sequence — Part 9'    +++    [11:40 - 18.11.2017] nimroth cynthor solved the Level I challenge 'Monoalphabetic Substitution'    +++