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 3040 100
2 Original Caesar Cipher I 1995 100
3 Number Sequence — Part 2 I 1400 100
4 Caesar Encryption I 1013 100
5 Beaver Code I 767 100
6 Letter to the Templars — Part 1 I 687 100
7 Number Sequence — Part 3 I 633 100
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 326 100
16 Cracking SHA1-Hashed Passwords II 313 1093
17 Homophonic Encryption Part 1 I 310 100
18 Homophonic Encryption Part 2 I 265 100
19 One-Time Pad with Flaws I 237 100
20 Snow White and the seven dwarfs I 225 100
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 185 100
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 139 100
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 119 100
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 Cascading Encryption — Part 1/3 I 54 100
79 Multilingual Monoalphabetic Substitution I 54 100
80 AES key — encoded in the machine readable zone of a European ePassport II 53 1096
81 Heartbleed — Part 2 I 53 100
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 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 38 1092
91 Number Sequence — Part 7 I 38 100
92 Strange Message from Thessaloniki I 37 100
93 Monoalphabetic substitution with camouflage — Part 4 I 37 100
94 News from Castle Mansfeld I 36 100
95 Unconcealed RSA messages II 36 1095
96 Monoalphabetic substitution with camouflage — Part 2 II 35 1095
97 Music Code — Part 1 I 35 100
98 Music Code — Part 2 II 35 1093
99 Weakened Granit — Part 1 I 35 100
100 Ku Klux Klan X 34 var
101 An 'unhearable' message I 33 100
102 CMEA 1 II 33 1091
103 Pigpen with a twist — Part 2 II 33 1094
104 Monoalphabetic substitution with camouflage — Part 3 II 33 1095
105 New Year's Greetings — Part 1 I 32 100
106 Double Column Transposition — Part 2 II 32 1110
107 Keyshanc — Part 2 II 32 1097
108 M-138 — Part 3 II 31 1116
109 RSA Factoring Challenge: RSA-704 II 31 0
110 Double Column Transposition — Part 4 II 31 1110
111 Not-so-Secret Message from Malawi — Part II (ECC) II 29 1091
112 Pigpen with a twist — Part 3 II 29 1094
113 Heartbleed — Part 3 II 28 1113
114 Double Column Transposition — Part 3 II 28 1110
115 New Year's Greetings — Part 2 I 28 100
116 Kaskade-S/T — Part 3 II 27 1092
117 New Year's Greetings — Part 3 I 27 100
118 New Year's Greetings — Part 4 I 26 100
119 ORYX Stream Cipher — Part 3 (revised) II 26 1103
120 RSA Factoring Challenge: RSA-210 II 23 0
121 CMEA 2 III 21 13238
122 Monoalphabetic Substitution with Camouflage — Part 5 II 21 1096
123 Double Column Transposition — Part 1 II 20 1109
124 Typex — Part 1 II 20 1102
125 Spanish Strip Cipher — Part 1 II 19 1109
126 RSA with Special d III 18 13229
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 1143
133 Number Sequence — Part 9 I 12 111
134 New Year's Greetings — Part 5 II 12 1136
135 M-138 — Part 4 II 11 1116
136 Sigaba Part 1 II 11 1091
137 Flawed Usage of a OTP Cipher by the BND II 10 1125
138 Cascading Encryption — Part 2/3 II 10 1102
139 ORYX Stream Cipher — Part 4a II 10 1109
140 Cascading Encryption — Part 3/3 II 10 1102
141 Kaskade-S/T — Part 5 II 9 1093
142 Weakened Handycipher — Part 3 II 9 1121
143 Weakened Handycipher — Part 1 II 9 1121
144 Weakened Handycipher — Part 2 II 8 1121
145 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 8 1093
146 Akelarre Part 1 II 7 1091
147 RSA Factoring Challenge: RSA-220 II 7 0
148 Double Column Transposition — Part 5 II 5 1111
149 Handycipher — Part 2 II 4 1118
150 Handycipher — Part 3 III 4 13673
151 Notes of an Italian Soldier X 4 var
152 Handycipher — Part 1 II 3 1118
153 Weakened Handycipher — Part 4 II 3 1143
154 Handycipher — Part 6 III 3 14024
155 Spirale — Part 3 II 3 1125
156 Holographic Encryption — Part 1 II 3 1180
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 14024
161 Spirale — Part 1 II 3 1125
162 Sigaba Part 2 III 3 13229
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 14024
167 ORYX Stream Cipher — Part 4b III 2 13535
168 Double Column Transposition X 2 var
169 Extended Handycipher — Part 4 III 2 14024
170 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 2 1206
171 Unknown Author X 2 var
172 Holographic Encryption — Part 2 II 2 1180
173 Handycipher — Part 4 III 2 14024
174 Handycipher — Part 8 III 1 14330
175 Handycipher — Part 9 III 1 14330
176 Hilly — Part 1 II 1 1166
177 Substitution Cipher with Non-Prefix Codes III 1 13272
178 Beale Ciphers X 1 var
179 Handycipher — Part 7 III 1 14330
180 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 1 1143
181 Extended Handycipher — Part 6 III 1 14024
182 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1098
183 Weakened ElsieFour — Part 1 II 0 1281
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 1310
189 Weakened Granit — Part 2 II 0 1126
190 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1143
191 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1143
192 Weakened Granit — Part 3 II 0 1126
193 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1143
194 ElsieFour — Part 1 II 0 1281
195 RSA Factoring Challenge: RSA-2048 III 0 13318
196 RSA Factoring Challenge: RSA-896 III 0 13318
197 RSA Factoring Challenge: RSA-280 III 0 13318
198 RSA Factoring Challenge: RSA-270 III 0 13318
199 RSA Factoring Challenge: RSA-260 III 0 13318
200 RSA Factoring Challenge: RSA-250 III 0 13318
201 RSA Factoring Challenge: RSA-290 III 0 13318
202 RSA Factoring Challenge: RSA-300 III 0 13318
203 RSA Factoring Challenge: RSA-320 III 0 13318
204 RSA Factoring Challenge: RSA-310 III 0 13318
205 RSA Factoring Challenge: RSA-1024 III 0 13318
206 RSA Factoring Challenge: RSA-309 III 0 13318
207 RSA Factoring Challenge: RSA-240 III 0 13318
208 RSA Factoring Challenge: RSA-232 III 0 13318
209 World Record Challenge: Break 65 Bits of AES III 0 13229
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 13245
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 13287
218 Kaskade-S/T — Part 4 II 0 1093
219 RSA Factoring Challenge: RSA-330 III 0 13318
220 RSA Factoring Challenge: RSA-340 III 0 13318
221 RSA Factoring Challenge: RSA-490 III 0 13318
222 RSA Factoring Challenge: RSA-500 III 0 13318
223 RSA Factoring Challenge: RSA-480 III 0 13318
224 RSA Factoring Challenge: RSA-470 III 0 13318
225 RSA Factoring Challenge: RSA-1536 III 0 13318
226 RSA Factoring Challenge: RSA-617 III 0 13318
227 ORYX Stream Cipher — Part 4d III 0 13442
228 Spanish Strip Cipher — Part 3 X 0 var
229 Double Column Transposition Reloaded — Part 3 III 0 13493
230 Double Column Transposition Reloaded — Part 2 III 0 13493
231 Double Column Transposition Reloaded — Part 1 III 0 13493
232 RSA Factoring Challenge: RSA-460 III 0 13318
233 RSA Factoring Challenge: RSA-450 III 0 13318
234 RSA Factoring Challenge: RSA-380 III 0 13318
235 RSA Factoring Challenge: RSA-370 III 0 13318
236 RSA Factoring Challenge: RSA-360 III 0 13318
237 RSA Factoring Challenge: RSA-350 III 0 13318
238 RSA Factoring Challenge: RSA-390 III 0 13318
239 RSA Factoring Challenge: RSA-400 III 0 13318
240 RSA Factoring Challenge: RSA-440 III 0 13318
241 RSA Factoring Challenge: RSA-430 III 0 13318
242 RSA Factoring Challenge: RSA-420 III 0 13318
243 RSA Factoring Challenge: RSA-410 III 0 13318
244 ORYX Stream Cipher — Part 4c III 0 13535
 
 
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   +++    [20:34 - 24.11.2017] Nonax19 solved the Level I challenge 'Number Sequence'    +++    [20:07 - 24.11.2017] Nonax19 solved the Level I challenge 'Original Caesar Cipher'    +++    [20:28 - 23.11.2017] nimroth cynthor solved the Level I challenge 'Nils away on travel'    +++    [19:50 - 23.11.2017] nimroth cynthor solved the Level I challenge 'Classical Ciphers^3'    +++    [13:22 - 23.11.2017] Bart13 solved the Level I challenge 'Number Sequence — Part 9'    +++