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 2836 100
2 Original Caesar Cipher I 1839 100
3 Number Sequence — Part 2 I 1293 100
4 Caesar Encryption I 950 100
5 Beaver Code I 696 100
6 Letter to the Templars — Part 1 I 638 100
7 Number Sequence — Part 3 I 589 100
8 Letter to the Templars — Part 2 I 512 100
9 Number Sequence — Part 4 I 470 100
10 A hidden word I 445 100
11 Monoalphabetic Substitution I 418 100
12 Letter to the Templars — Part 3 II 397 1104
13 Affine Codes / Modulo Arithmetic with N / Extended Euclid I 372 100
14 Factorization Cipher — Part 1 I 331 100
15 Grille Cipher I 306 100
16 Homophonic Encryption Part 1 I 291 100
17 Cracking SHA1-Hashed Passwords II 274 1096
18 Homophonic Encryption Part 2 I 253 100
19 One-Time Pad with Flaws I 225 100
20 Snow White and the seven dwarfs I 212 100
21 Alice's Birthday Party (Part 1) II 184 1094
22 Alice's Birthday Party (Part 2) II 175 1094
23 From Russia with Love I 171 100
24 Reserve Hand Procedure — Part 1 I 150 100
25 Modified Caesar Cipher I 149 100
26 How do you become a big cryptographer? I 147 100
27 Letter from the Alleged Countess Julie von Ortenburg I 135 100
28 Broadcasting and low exponent — RSA-Attack II 134 1097
29 Classical Ciphers^3 I 132 100
30 Not-so-Secret Message from Malawi — Part I (RSA) II 129 1094
31 Enigma Messages with Repeated Letters — Part 1 I 126 100
32 Number Sequence — Part 8 I 122 100
33 Brute-Force-Attack on Triple-DES with Reduced Key Space II 116 1094
34 M-138 — Part 1 I 115 100
35 Pigpen with a twist — Part 1 I 109 100
36 The Book Code: A Challenge for Bookworms I 107 100
37 Hybrid Encryption I II 107 1094
38 Nils away on travel I 107 100
39 RSA: Two different keys — same ciphertext II 106 1097
40 Factorization Cipher — Part 2 II 101 1099
41 Molehunt (Part 1/3) I 101 100
42 A Secret Message from Castle Mansfeld I 100 100
43 Enigma Part 1 II 100 1094
44 Molehunt (Part 2/3) I 98 100
45 Trifid Cipher I 88 100
46 ¿No Hablas Español? No problemo! I 88 100
47 A really long number sequence II 87 1098
48 ADFGVX — Part 2 I 83 100
49 Kaskade-S/T — Part 1 I 82 100
50 Enigma Combinatorics I 77 100
51 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1 I 74 100
52 ADFGVX — Part 1 I 73 100
53 Double Columnar Transposition I 72 100
54 Playfair Encryption I 71 100
55 Heartbleed — Part 1 I 70 100
56 Playfair with hints about the grid I 69 100
57 ECDH-Key Exchange for Beginners I 68 100
58 M-138 — Part 2 II 66 1126
59 Enigma Part 2 II 65 1094
60 Zodiac Cipher I 64 100
61 ORYX Stream Cipher Part I II 64 1094
62 Factorization Cipher — Part 3 II 63 1099
63 Number Sequence — Part 6 I 62 100
64 Molehunt (Part 3/3) II 59 1094
65 A hidden word — Part 2 I 57 100
66 The Last Note I 57 100
67 Enigma Messages with Repeated Letters — Part 3 I 56 100
68 Enigma Messages with Repeated Letters — Part 2 I 56 100
69 Smartcard RSA II 55 1094
70 Hill Cipher with Sudoku Key I 54 100
71 Partial Key Exposure with RSA — Part 1 II 54 1100
72 Enigma Messages with Repeated Letters — Part 5 I 52 100
73 Number Sequence — Part 5 I 52 100
74 Turing Bombe Enigma I I 51 100
75 Cascading Encryption — Part 1/3 I 50 100
76 BCR code (Book-Caesar-RSA) II 50 1103
77 Enigma Messages I 50 100
78 Image Noise I 48 100
79 Enigma Messages with Repeated Letters — Part 4 I 48 100
80 Multilingual Monoalphabetic Substitution I 48 100
81 Heartbleed — Part 2 I 46 100
82 Recycled One-Time Pad I 45 100
83 AES key — encoded in the machine readable zone of a European ePassport II 44 1100
84 An Invisible Message I 43 100
85 Unusual encryption using a diophantine equation II 40 1098
86 Monoalphabetic substitution with camouflage — Part 1 I 40 100
87 Kaskade-S/T — Part 2 II 39 1095
88 ORYX Stream Cipher Part II II 37 1094
89 Keyshanc — Part 1 II 36 1101
90 Lunchtime Attack on the Fully Homomorphic Encryption Scheme II 34 1095
91 Strange Message from Thessaloniki I 34 100
92 Monoalphabetic substitution with camouflage — Part 4 I 34 100
93 Unconcealed RSA messages II 33 1098
94 News from Castle Mansfeld I 33 100
95 Music Code — Part 2 II 33 1096
96 Monoalphabetic substitution with camouflage — Part 2 II 33 1099
97 Music Code — Part 1 I 33 100
98 Ku Klux Klan X 32 var
99 Number Sequence — Part 7 I 31 100
100 Pigpen with a twist — Part 2 II 31 1098
101 Monoalphabetic substitution with camouflage — Part 3 II 31 1099
102 New Year's Greetings — Part 1 I 30 100
103 Weakened Granit — Part 1 I 30 100
104 An 'unhearable' message I 30 100
105 Double Column Transposition — Part 4 II 29 1118
106 Keyshanc — Part 2 II 28 1101
107 RSA Factoring Challenge: RSA-704 II 28 0
108 Double Column Transposition — Part 2 II 28 1117
109 M-138 — Part 3 II 27 1126
110 New Year's Greetings — Part 2 I 26 100
111 Not-so-Secret Message from Malawi — Part II (ECC) II 26 1094
112 CMEA 1 II 26 1094
113 New Year's Greetings — Part 3 I 25 100
114 Double Column Transposition — Part 3 II 25 1117
115 Pigpen with a twist — Part 3 II 25 1098
116 New Year's Greetings — Part 4 I 24 100
117 Kaskade-S/T — Part 3 II 23 1095
118 ORYX Stream Cipher — Part 3 (revised) II 23 1109
119 Heartbleed — Part 3 II 22 1121
120 RSA Factoring Challenge: RSA-210 II 21 0
121 Monoalphabetic Substitution with Camouflage — Part 5 II 19 1100
122 Typex — Part 1 II 18 1107
123 CMEA 2 III 18 13288
124 Double Column Transposition — Part 1 II 18 1117
125 Lattice Part 1 II 18 1095
126 Spanish Strip Cipher — Part 1 II 17 1116
127 Typex — Part 2 II 16 1107
128 RSA with Special d III 16 13278
129 Spanish Strip Cipher — Part 2 II 14 1116
130 Concealed Messages — Vigenère's Night Sky X 14 var
131 Purple 1 II 12 1094
132 New Year's Greetings — Part 5 II 11 1161
133 Cascading Encryption — Part 3/3 II 10 1107
134 ASAC — A Strong(er) ADFGVX Cipher — Part 1 II 10 1181
135 Sigaba Part 1 II 10 1094
136 Cascading Encryption — Part 2/3 II 10 1107
137 Flawed Usage of a OTP Cipher by the BND II 9 1140
138 ORYX Stream Cipher — Part 4a II 8 1117
139 Weakened Handycipher — Part 3 II 8 1133
140 Weakened Handycipher — Part 1 II 8 1133
141 M-138 — Part 4 II 8 1126
142 Kaskade-S/T — Part 5 II 8 1096
143 Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2 II 7 1096
144 Akelarre Part 1 II 7 1094
145 Weakened Handycipher — Part 2 II 7 1133
146 Double Column Transposition — Part 5 II 5 1119
147 RSA Factoring Challenge: RSA-220 II 4 0
148 Notes of an Italian Soldier X 4 var
149 Handycipher — Part 2 II 3 1130
150 Handycipher — Part 3 III 3 13841
151 Handycipher — Part 1 II 2 1130
152 Handycipher — Part 6 III 2 14494
153 Handycipher — Part 5 III 2 14494
154 Spirale — Part 1 II 2 1140
155 Spirale — Part 2 II 2 1140
156 Spirale — Part 3 II 2 1140
157 Weakened Handycipher — Part 5 II 2 1178
158 Unknown Author X 2 var
159 Double Column Transposition X 2 var
160 Weakened Handycipher — Part 6 II 2 1178
161 Weakened Handycipher — Part 4 II 2 1178
162 Sigaba Part 2 III 2 13278
163 Monoalphabetic Substitution with Camouflage — Part 6 II 1 1102
164 ORYX Stream Cipher — Part 4b III 1 13650
165 Hilly — Part 1 II 1 1349
166 Beale Ciphers X 1 var
167 Substitution Cipher with Non-Prefix Codes III 1 13327
168 Extended Handycipher — Part 5 III 1 14494
169 Extended Handycipher — Part 1 II 1 1131
170 Extended Handycipher — Part 2 II 1 1131
171 Extended Handycipher — Part 3 II 1 1131
172 Handycipher — Part 4 III 1 14494
173 Handycipher — Part 7 III 0 16133
174 ASAC — A Strong(er) ADFGVX Cipher — Part 5 II 0 1181
175 Double-Column Transposition/Granit — Part 1 II 0 1136
176 Handycipher — Part 9 III 0 16133
177 Handycipher — Part 8 III 0 16133
178 ASAC — A Strong(er) ADFGVX Cipher — Part 4 II 0 1181
179 ASAC — A Strong(er) ADFGVX Cipher — Part 3 II 0 1181
180 Weakened Granit — Part 2 II 0 1142
181 Weakened Granit — Part 3 II 0 1142
182 Extended Handycipher — Part 6 III 0 14494
183 Spirale — Part 4 II 0 1140
184 Double-Column Transposition/Granit — Part 3 II 0 1136
185 Double-Column Transposition/Granit — Part 2 II 0 1136
186 ASAC — A Strong(er) ADFGVX Cipher — Part 2 II 0 1181
187 Extended Handycipher — Part 4 III 0 14494
188 RSA Factoring Challenge: RSA-490 III 0 13381
189 RSA Factoring Challenge: RSA-896 III 0 13381
190 RSA Factoring Challenge: RSA-280 III 0 13381
191 RSA Factoring Challenge: RSA-270 III 0 13381
192 RSA Factoring Challenge: RSA-260 III 0 13381
193 RSA Factoring Challenge: RSA-250 III 0 13381
194 RSA Factoring Challenge: RSA-290 III 0 13381
195 RSA Factoring Challenge: RSA-300 III 0 13381
196 RSA Factoring Challenge: RSA-320 III 0 13381
197 RSA Factoring Challenge: RSA-310 III 0 13381
198 RSA Factoring Challenge: RSA-1024 III 0 13381
199 RSA Factoring Challenge: RSA-309 III 0 13381
200 RSA Factoring Challenge: RSA-240 III 0 13381
201 RSA Factoring Challenge: RSA-232 III 0 13381
202 World Record Challenge: Break 65 Bits of AES III 0 13278
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 13296
207 Twelve-Year-Old Murder Case X 0 var
208 RSA Factoring Challenge: RSA-230 II 0 1100
209 The third ENIGMA M4 message X 0 var
210 Digital Signatures: DSA with Medium Fields III 0 13344
211 Kaskade-S/T — Part 4 II 0 1096
212 RSA Factoring Challenge: RSA-330 III 0 13381
213 RSA Factoring Challenge: RSA-340 III 0 13381
214 RSA Factoring Challenge: RSA-500 III 0 13381
215 RSA Factoring Challenge: RSA-617 III 0 13381
216 RSA Factoring Challenge: RSA-480 III 0 13381
217 RSA Factoring Challenge: RSA-470 III 0 13381
218 RSA Factoring Challenge: RSA-1536 III 0 13381
219 RSA Factoring Challenge: RSA-2048 III 0 13381
220 ORYX Stream Cipher — Part 4d III 0 13530
221 Spanish Strip Cipher — Part 3 X 0 var
222 Double Column Transposition Reloaded — Part 3 III 0 13595
223 Double Column Transposition Reloaded — Part 2 III 0 13595
224 Double Column Transposition Reloaded — Part 1 III 0 13595
225 RSA Factoring Challenge: RSA-460 III 0 13381
226 RSA Factoring Challenge: RSA-450 III 0 13381
227 RSA Factoring Challenge: RSA-380 III 0 13381
228 RSA Factoring Challenge: RSA-370 III 0 13381
229 RSA Factoring Challenge: RSA-360 III 0 13381
230 RSA Factoring Challenge: RSA-350 III 0 13381
231 RSA Factoring Challenge: RSA-390 III 0 13381
232 RSA Factoring Challenge: RSA-400 III 0 13381
233 RSA Factoring Challenge: RSA-440 III 0 13381
234 RSA Factoring Challenge: RSA-430 III 0 13381
235 RSA Factoring Challenge: RSA-420 III 0 13381
236 RSA Factoring Challenge: RSA-410 III 0 13381
237 ORYX Stream Cipher — Part 4c III 0 13650
 
 
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   +++    [16:12 - 20.02.2017] klemenko7 solved the Level I challenge 'Number Sequence — Part 2'    +++    [16:09 - 20.02.2017] klemenko7 solved the Level I challenge 'Number Sequence'    +++    [11:55 - 20.02.2017] plexor solved the Level I challenge 'Caesar Encryption'    +++    [05:30 - 20.02.2017] theflashesarrow solved the Level I challenge 'Number Sequence'    +++    [19:42 - 19.02.2017] klemenko7 solved the Level I challenge 'Grille Cipher'    +++