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 2957 100
2 Original Caesar Cipher I 1938 100
3 Number Sequence — Part 2 I 1359 100
4 Caesar Encryption I 994 100
5 Beaver Code I 748 100
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 479 100
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 How do you become a big cryptographer? I 155 100
26 Reserve Hand Procedure — Part 1 I 155 100
27 Broadcasting and low exponent — RSA-Attack II 149 1095
28 Number Sequence — Part 8 I 144 100
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 Hybrid Encryption I II 117 1092
36 Nils away on travel I 117 100
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 111 1095
40 Enigma Part 1 II 108 1092
41 Molehunt (Part 1/3) I 107 100
42 A Secret Message from Castle Mansfeld I 105 100
43 Factorization Cipher — Part 2 II 105 1097
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 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 79 100
52 ADFGVX — 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 ECDH-Key Exchange for Beginners I 74 100
57 Playfair with hints about the grid 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 Zodiac Cipher I 68 100
63 Factorization Cipher — Part 3 II 68 1097
64 A hidden word — Part 2 I 63 100
65 Enigma Messages with Repeated Letters — Part 2 I 62 100
66 Molehunt (Part 3/3) II 62 1092
67 Enigma Messages with Repeated Letters — Part 3 I 61 100
68 Hill Cipher with Sudoku Key I 60 100
69 The Last Note I 60 100
70 Partial Key Exposure with RSA — Part 1 II 59 1098
71 Enigma Messages with Repeated Letters — Part 5 I 57 100
72 Smartcard RSA II 57 1092
73 BCR code (Book-Caesar-RSA) II 56 1101
74 Enigma Messages I 55 100
75 Number Sequence — Part 5 I 55 100
76 Turing Bombe Enigma I I 55 100
77 Cascading Encryption — Part 1/3 I 54 100
78 Image Noise 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 Unusual encryption using a diophantine equation II 44 1096
86 Kaskade-S/T — Part 2 II 43 1094
87 Monoalphabetic substitution with camouflage — Part 1 I 43 100
88 ORYX Stream Cipher Part II II 40 1092
89 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 38 1093
90 Strange Message from Thessaloniki I 37 100
91 Keyshanc — Part 1 II 37 1099
92 News from Castle Mansfeld I 36 100
93 Monoalphabetic substitution with camouflage — Part 4 I 36 100
94 Unconcealed RSA messages II 35 1096
95 Number Sequence — Part 7 I 34 100
96 Music Code — Part 1 I 34 100
97 Music Code — Part 2 II 34 1094
98 Weakened Granit — Part 1 I 33 100
99 Monoalphabetic substitution with camouflage — Part 2 II 33 1097
100 An 'unhearable' message I 32 100
101 CMEA 1 II 32 1093
102 Ku Klux Klan X 32 var
103 Monoalphabetic substitution with camouflage — Part 3 II 31 1097
104 New Year's Greetings — Part 1 I 31 100
105 Pigpen with a twist — Part 2 II 31 1096
106 RSA Factoring Challenge: RSA-704 II 30 0
107 M-138 — Part 3 II 30 1120
108 Double Column Transposition — Part 2 II 30 1113
109 Keyshanc — Part 2 II 29 1099
110 Double Column Transposition — Part 4 II 29 1113
111 Not-so-Secret Message from Malawi — Part II (ECC) II 28 1092
112 Pigpen with a twist — Part 3 II 27 1096
113 Heartbleed — Part 3 II 27 1116
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 1106
118 Kaskade-S/T — Part 3 II 25 1094
119 New Year's Greetings — Part 4 I 25 100
120 RSA Factoring Challenge: RSA-210 II 22 0
121 CMEA 2 III 21 13260
122 Monoalphabetic Substitution with Camouflage — Part 5 II 19 1098
123 Spanish Strip Cipher — Part 1 II 19 1112
124 Typex — Part 1 II 19 1104
125 Double Column Transposition — Part 1 II 19 1112
126 Lattice Part 1 II 18 1094
127 RSA with Special d III 16 13251
128 Typex — Part 2 II 16 1104
129 Spanish Strip Cipher — Part 2 II 16 1112
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 1145
133 Sigaba Part 1 II 11 1092
134 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 11 1156
135 M-138 — Part 4 II 11 1120
136 Cascading Encryption — Part 3/3 II 10 1104
137 Cascading Encryption — Part 2/3 II 10 1104
138 Weakened Handycipher — Part 3 II 9 1126
139 Weakened Handycipher — Part 1 II 9 1126
140 Flawed Usage of a OTP Cipher by the BND II 9 1131
141 ORYX Stream Cipher — Part 4a II 9 1113
142 Kaskade-S/T — Part 5 II 9 1094
143 Weakened Handycipher — Part 2 II 8 1126
144 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 8 1094
145 Akelarre Part 1 II 7 1092
146 RSA Factoring Challenge: RSA-220 II 6 0
147 Double Column Transposition — Part 5 II 5 1114
148 Notes of an Italian Soldier X 4 var
149 Handycipher — Part 3 III 4 13742
150 Handycipher — Part 2 II 4 1123
151 Handycipher — Part 1 II 3 1123
152 Handycipher — Part 5 III 3 14188
153 Weakened Handycipher — Part 4 II 3 1155
154 Handycipher — Part 6 III 3 14188
155 Sigaba Part 2 III 3 13251
156 Weakened Handycipher — Part 6 II 3 1155
157 Weakened Handycipher — Part 5 II 3 1155
158 ORYX Stream Cipher — Part 4b III 2 13584
159 Extended Handycipher — Part 2 II 2 1124
160 Extended Handycipher — Part 3 II 2 1124
161 Extended Handycipher — Part 1 II 2 1124
162 Extended Handycipher — Part 5 III 2 14188
163 Holographic Encryption — Part 1 II 2 1227
164 Unknown Author X 2 var
165 Handycipher — Part 4 III 2 14188
166 Extended Handycipher — Part 4 III 2 14188
167 Spirale — Part 2 II 2 1131
168 Spirale — Part 3 II 2 1131
169 Holographic Encryption — Part 2 II 2 1227
170 Double Column Transposition X 2 var
171 Spirale — Part 1 II 2 1131
172 Handycipher — Part 9 III 1 14673
173 Substitution Cipher with Non-Prefix Codes III 1 13296
174 Handycipher — Part 8 III 1 14673
175 Hilly — Part 1 II 1 1194
176 Beale Ciphers X 1 var
177 Kaskade-S/T — Part 6 (RansomKaskade Part 1) II 1 1385
178 Handycipher — Part 7 III 1 14673
179 Extended Handycipher — Part 6 III 1 14188
180 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1100
181 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 0 1156
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 1131
186 Weakened Granit — Part 2 II 0 1132
187 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1156
188 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1156
189 Weakened Granit — Part 3 II 0 1132
190 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1156
191 RSA Factoring Challenge: RSA-500 III 0 13345
192 RSA Factoring Challenge: RSA-896 III 0 13345
193 RSA Factoring Challenge: RSA-280 III 0 13345
194 RSA Factoring Challenge: RSA-270 III 0 13345
195 RSA Factoring Challenge: RSA-260 III 0 13345
196 RSA Factoring Challenge: RSA-250 III 0 13345
197 RSA Factoring Challenge: RSA-290 III 0 13345
198 RSA Factoring Challenge: RSA-300 III 0 13345
199 RSA Factoring Challenge: RSA-320 III 0 13345
200 RSA Factoring Challenge: RSA-310 III 0 13345
201 RSA Factoring Challenge: RSA-1024 III 0 13345
202 RSA Factoring Challenge: RSA-309 III 0 13345
203 RSA Factoring Challenge: RSA-240 III 0 13345
204 RSA Factoring Challenge: RSA-232 III 0 13345
205 World Record Challenge: Break 65 Bits of AES III 0 13251
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 13267
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 13312
214 Kaskade-S/T — Part 4 II 0 1094
215 RSA Factoring Challenge: RSA-330 III 0 13345
216 RSA Factoring Challenge: RSA-340 III 0 13345
217 RSA Factoring Challenge: RSA-490 III 0 13345
218 RSA Factoring Challenge: RSA-617 III 0 13345
219 RSA Factoring Challenge: RSA-480 III 0 13345
220 RSA Factoring Challenge: RSA-470 III 0 13345
221 RSA Factoring Challenge: RSA-1536 III 0 13345
222 RSA Factoring Challenge: RSA-2048 III 0 13345
223 ORYX Stream Cipher — Part 4d III 0 13479
224 Spanish Strip Cipher — Part 3 X 0 var
225 Double Column Transposition Reloaded — Part 3 III 0 13536
226 Double Column Transposition Reloaded — Part 2 III 0 13536
227 Double Column Transposition Reloaded — Part 1 III 0 13536
228 RSA Factoring Challenge: RSA-460 III 0 13345
229 RSA Factoring Challenge: RSA-450 III 0 13345
230 RSA Factoring Challenge: RSA-380 III 0 13345
231 RSA Factoring Challenge: RSA-370 III 0 13345
232 RSA Factoring Challenge: RSA-360 III 0 13345
233 RSA Factoring Challenge: RSA-350 III 0 13345
234 RSA Factoring Challenge: RSA-390 III 0 13345
235 RSA Factoring Challenge: RSA-400 III 0 13345
236 RSA Factoring Challenge: RSA-440 III 0 13345
237 RSA Factoring Challenge: RSA-430 III 0 13345
238 RSA Factoring Challenge: RSA-420 III 0 13345
239 RSA Factoring Challenge: RSA-410 III 0 13345
240 ORYX Stream Cipher — Part 4c III 0 13584
 
 
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   +++    [14:42 - 21.07.2017] zyannnn solved the Level I challenge 'Number Sequence'    +++    [12:11 - 21.07.2017] Xian solved the Level I challenge 'Beaver Code'    +++    [09:21 - 21.07.2017] Mushmom solved the Level I challenge 'Number Sequence — Part 8'    +++    [09:18 - 21.07.2017] Mushmom solved the Level II challenge 'Broadcasting and low exponent — RSA-Attack'    +++    [22:24 - 20.07.2017] Akonia12 solved the Level I challenge 'M-138 — Part 1'    +++