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 2966 100
2 Original Caesar Cipher I 1940 100
3 Number Sequence — Part 2 I 1362 100
4 Caesar Encryption I 994 100
5 Beaver Code I 749 100
6 Letter to the Templars — Part 1 I 671 100
7 Number Sequence — Part 3 I 616 100
8 Letter to the Templars — Part 2 I 536 100
9 Number Sequence — Part 4 I 494 100
10 A hidden word I 481 100
11 Monoalphabetic Substitution I 429 100
12 Letter to the Templars — Part 3 II 420 1101
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 385 100
14 Factorization Cipher — Part 1 I 344 100
15 Grille Cipher I 320 100
16 Homophonic Encryption Part 1 I 305 100
17 Cracking SHA1-Hashed Passwords II 296 1094
18 Homophonic Encryption Part 2 I 262 100
19 One-Time Pad with Flaws I 235 100
20 Snow White and the seven dwarfs I 222 100
21 Alice's Birthday Party (Part 1) II 198 1092
22 Alice's Birthday Party (Part 2) II 189 1092
23 From Russia with Love I 182 100
24 Modified Caesar Cipher I 158 100
25 Reserve Hand Procedure — Part 1 I 155 100
26 How do you become a big cryptographer? I 155 100
27 Broadcasting and low exponent — RSA-Attack II 149 1095
28 Number Sequence — Part 8 I 145 100
29 Letter from the Alleged Countess Julie von Ortenburg I 144 100
30 Classical Ciphers^3 I 138 100
31 Not-so-Secret Message from Malawi — Part I (RSA) II 137 1092
32 Enigma Messages with Repeated Letters — Part 1 I 132 100
33 M-138 — Part 1 I 123 100
34 Brute-Force-Attack on Triple-DES with Reduced Key Space II 122 1092
35 Nils away on travel I 117 100
36 Hybrid Encryption I II 117 1092
37 Pigpen with a twist — Part 1 I 116 100
38 The Book Code: A Challenge for Bookworms I 113 100
39 RSA: Two different keys — same ciphertext II 112 1095
40 Enigma Part 1 II 108 1092
41 Molehunt (Part 1/3) I 107 100
42 Factorization Cipher — Part 2 II 105 1097
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 96 100
46 Trifid Cipher I 93 100
47 A really long number sequence II 91 1096
48 ADFGVX — Part 2 I 89 100
49 Kaskade-S/T — Part 1 I 88 100
50 Enigma Combinatorics I 82 100
51 ADFGVX — Part 1 I 79 100
52 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 79 100
53 Heartbleed — Part 1 I 78 100
54 Double Columnar Transposition I 77 100
55 Playfair Encryption I 77 100
56 Playfair with hints about the grid I 74 100
57 ECDH-Key Exchange for Beginners I 74 100
58 M-138 — Part 2 II 73 1120
59 ORYX Stream Cipher Part I II 72 1092
60 Number Sequence — Part 6 I 71 100
61 Enigma Part 2 II 70 1092
62 Factorization Cipher — Part 3 II 68 1097
63 Zodiac Cipher I 68 100
64 A hidden word — Part 2 I 63 100
65 Molehunt (Part 3/3) II 62 1092
66 Enigma Messages with Repeated Letters — Part 2 I 62 100
67 Hill Cipher with Sudoku Key I 61 100
68 The Last Note I 61 100
69 Enigma Messages with Repeated Letters — Part 3 I 61 100
70 Partial Key Exposure with RSA — Part 1 II 59 1098
71 Smartcard RSA II 58 1092
72 Enigma Messages with Repeated Letters — Part 5 I 57 100
73 BCR code (Book-Caesar-RSA) II 56 1101
74 Turing Bombe Enigma I I 55 100
75 Enigma Messages I 55 100
76 Number Sequence — Part 5 I 55 100
77 Image Noise I 54 100
78 Cascading Encryption — Part 1/3 I 54 100
79 Enigma Messages with Repeated Letters — Part 4 I 53 100
80 Heartbleed — Part 2 I 52 100
81 Multilingual Monoalphabetic Substitution I 51 100
82 AES key — encoded in the machine readable zone of a European ePassport II 47 1097
83 Recycled One-Time Pad I 46 100
84 An Invisible Message I 45 100
85 Monoalphabetic substitution with camouflage — Part 1 I 44 100
86 Unusual encryption using a diophantine equation II 44 1096
87 Kaskade-S/T — Part 2 II 43 1093
88 ORYX Stream Cipher Part II II 40 1092
89 Keyshanc — Part 1 II 38 1099
90 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 38 1093
91 Strange Message from Thessaloniki I 37 100
92 News from Castle Mansfeld I 36 100
93 Unconcealed RSA messages II 36 1096
94 Monoalphabetic substitution with camouflage — Part 4 I 36 100
95 Number Sequence — Part 7 I 34 100
96 Monoalphabetic substitution with camouflage — Part 2 II 34 1097
97 Music Code — Part 1 I 34 100
98 Music Code — Part 2 II 34 1094
99 CMEA 1 II 33 1093
100 Weakened Granit — Part 1 I 33 100
101 Monoalphabetic substitution with camouflage — Part 3 II 32 1097
102 An 'unhearable' message I 32 100
103 Ku Klux Klan X 32 var
104 Pigpen with a twist — Part 2 II 31 1096
105 New Year's Greetings — Part 1 I 31 100
106 M-138 — Part 3 II 30 1120
107 Double Column Transposition — Part 2 II 30 1113
108 Double Column Transposition — Part 4 II 30 1113
109 RSA Factoring Challenge: RSA-704 II 30 0
110 Keyshanc — Part 2 II 30 1099
111 Not-so-Secret Message from Malawi — Part II (ECC) II 28 1092
112 Heartbleed — Part 3 II 27 1116
113 Pigpen with a twist — Part 3 II 27 1096
114 New Year's Greetings — Part 2 I 27 100
115 New Year's Greetings — Part 3 I 26 100
116 Double Column Transposition — Part 3 II 26 1113
117 ORYX Stream Cipher — Part 3 (revised) II 26 1105
118 New Year's Greetings — Part 4 I 25 100
119 Kaskade-S/T — Part 3 II 25 1093
120 RSA Factoring Challenge: RSA-210 II 22 0
121 CMEA 2 III 21 13259
122 Monoalphabetic Substitution with Camouflage — Part 5 II 20 1098
123 Double Column Transposition — Part 1 II 20 1112
124 Spanish Strip Cipher — Part 1 II 19 1112
125 Typex — Part 1 II 19 1104
126 Lattice Part 1 II 18 1094
127 Typex — Part 2 II 16 1104
128 Spanish Strip Cipher — Part 2 II 16 1112
129 RSA with Special d III 16 13249
130 Concealed Messages — Vigenère's Night Sky X 15 var
131 Purple 1 II 13 1092
132 New Year's Greetings — Part 5 II 12 1144
133 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 11 1155
134 Sigaba Part 1 II 11 1092
135 M-138 — Part 4 II 11 1120
136 Cascading Encryption — Part 2/3 II 10 1104
137 Cascading Encryption — Part 3/3 II 10 1104
138 ORYX Stream Cipher — Part 4a II 9 1112
139 Flawed Usage of a OTP Cipher by the BND II 9 1130
140 Weakened Handycipher — Part 3 II 9 1125
141 Weakened Handycipher — Part 1 II 9 1125
142 Kaskade-S/T — Part 5 II 9 1094
143 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 8 1094
144 Weakened Handycipher — Part 2 II 8 1125
145 RSA Factoring Challenge: RSA-220 II 7 0
146 Akelarre Part 1 II 7 1092
147 Double Column Transposition — Part 5 II 5 1114
148 Handycipher — Part 2 II 4 1123
149 Notes of an Italian Soldier X 4 var
150 Handycipher — Part 3 III 4 13737
151 Handycipher — Part 1 II 3 1123
152 Weakened Handycipher — Part 5 II 3 1154
153 Handycipher — Part 6 III 3 14176
154 Weakened Handycipher — Part 6 II 3 1154
155 Sigaba Part 2 III 3 13249
156 Weakened Handycipher — Part 4 II 3 1154
157 Handycipher — Part 5 III 3 14176
158 Extended Handycipher — Part 2 II 2 1124
159 Extended Handycipher — Part 3 II 2 1124
160 ORYX Stream Cipher — Part 4b III 2 13581
161 Extended Handycipher — Part 1 II 2 1124
162 Extended Handycipher — Part 5 III 2 14176
163 Holographic Encryption — Part 1 II 2 1222
164 Unknown Author X 2 var
165 Handycipher — Part 4 III 2 14176
166 Extended Handycipher — Part 4 III 2 14176
167 Spirale — Part 2 II 2 1130
168 Spirale — Part 3 II 2 1130
169 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 2 1344
170 Holographic Encryption — Part 2 II 2 1222
171 Double Column Transposition X 2 var
172 Spirale — Part 1 II 2 1130
173 Handycipher — Part 9 III 1 14643
174 Handycipher — Part 8 III 1 14643
175 Hilly — Part 1 II 1 1192
176 Substitution Cipher with Non-Prefix Codes III 1 13294
177 Beale Ciphers X 1 var
178 Handycipher — Part 7 III 1 14643
179 Extended Handycipher — Part 6 III 1 14176
180 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1100
181 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 0 1155
182 Double-Column Transposition/Granit — Part 3 II 0 1128
183 Double-Column Transposition/Granit — Part 2 II 0 1128
184 Double-Column Transposition/Granit — Part 1 II 0 1128
185 Spirale — Part 4 II 0 1130
186 Weakened Granit — Part 2 II 0 1132
187 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1155
188 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1155
189 Weakened Granit — Part 3 II 0 1132
190 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1155
191 RSA Factoring Challenge: RSA-500 III 0 13344
192 RSA Factoring Challenge: RSA-896 III 0 13344
193 RSA Factoring Challenge: RSA-280 III 0 13344
194 RSA Factoring Challenge: RSA-270 III 0 13344
195 RSA Factoring Challenge: RSA-260 III 0 13344
196 RSA Factoring Challenge: RSA-250 III 0 13344
197 RSA Factoring Challenge: RSA-290 III 0 13344
198 RSA Factoring Challenge: RSA-300 III 0 13344
199 RSA Factoring Challenge: RSA-320 III 0 13344
200 RSA Factoring Challenge: RSA-310 III 0 13344
201 RSA Factoring Challenge: RSA-1024 III 0 13344
202 RSA Factoring Challenge: RSA-309 III 0 13344
203 RSA Factoring Challenge: RSA-240 III 0 13344
204 RSA Factoring Challenge: RSA-232 III 0 13344
205 World Record Challenge: Break 65 Bits of AES III 0 13249
206 Kryptos X 0 var
207 Dorabella X 0 var
208 D'Agapeyeff X 0 var
209 Recovering the Private Key in the Fully Homomorphic Encryption Scheme III 0 13266
210 Twelve-Year-Old Murder Case X 0 var
211 RSA Factoring Challenge: RSA-230 II 0 1098
212 The third ENIGMA M4 message X 0 var
213 Digital Signatures: DSA with Medium Fields III 0 13310
214 Kaskade-S/T — Part 4 II 0 1094
215 RSA Factoring Challenge: RSA-330 III 0 13344
216 RSA Factoring Challenge: RSA-340 III 0 13344
217 RSA Factoring Challenge: RSA-490 III 0 13344
218 RSA Factoring Challenge: RSA-617 III 0 13344
219 RSA Factoring Challenge: RSA-480 III 0 13344
220 RSA Factoring Challenge: RSA-470 III 0 13344
221 RSA Factoring Challenge: RSA-1536 III 0 13344
222 RSA Factoring Challenge: RSA-2048 III 0 13344
223 ORYX Stream Cipher — Part 4d III 0 13477
224 Spanish Strip Cipher — Part 3 X 0 var
225 Double Column Transposition Reloaded — Part 3 III 0 13533
226 Double Column Transposition Reloaded — Part 2 III 0 13533
227 Double Column Transposition Reloaded — Part 1 III 0 13533
228 RSA Factoring Challenge: RSA-460 III 0 13344
229 RSA Factoring Challenge: RSA-450 III 0 13344
230 RSA Factoring Challenge: RSA-380 III 0 13344
231 RSA Factoring Challenge: RSA-370 III 0 13344
232 RSA Factoring Challenge: RSA-360 III 0 13344
233 RSA Factoring Challenge: RSA-350 III 0 13344
234 RSA Factoring Challenge: RSA-390 III 0 13344
235 RSA Factoring Challenge: RSA-400 III 0 13344
236 RSA Factoring Challenge: RSA-440 III 0 13344
237 RSA Factoring Challenge: RSA-430 III 0 13344
238 RSA Factoring Challenge: RSA-420 III 0 13344
239 RSA Factoring Challenge: RSA-410 III 0 13344
240 ORYX Stream Cipher — Part 4c III 0 13581
 
 
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   +++    [12:39 - 29.07.2017] michaelm solved the Level II challenge 'Kaskade-S/T — Part 6 (RansomKaskade Part 1)'    +++    [12:12 - 29.07.2017] george4096 solved the Level II challenge 'Monoalphabetic substitution with camouflage — Part 3'    +++    [12:08 - 29.07.2017] george4096 solved the Level II challenge 'Monoalphabetic substitution with camouflage — Part 2'    +++    [11:54 - 29.07.2017] george4096 solved the Level I challenge 'Monoalphabetic substitution with camouflage — Part 1'    +++    [11:30 - 29.07.2017] george4096 solved the Level II challenge 'Monoalphabetic Substitution with Camouflage — Part 5'    +++