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You can test your cryptanalysis skills here.
These tests will allow you to hone your cryptography skills. You will be faced with an encoded data. The challenge is to find the type of encoding or encryption and revert it back to find the solution.
Prerequisites:
Knowledge of most common encoding formats.
Knowledge of most common hash algorithms and ciphers.
Knowledge of a scripting language.


Challenges
| Challenge's Name | Validations | Number of points | Difficulty | Author | Who ? |
| Cesar |
10%
|
20 Points | Easy | Arod | Who ? |
| Message Digest 5 |
36%
|
5 Points | Very easy | g0uZ | Who ? |
| Old tricks |
8%
|
10 Points | Easy | m31z0nyx | Who ? |
| Protected archive |
10%
|
15 Points | Easy | g0uZ | Who ? |
| UUencoding |
32%
|
5 Points | Very easy | g0uZ | Who ? |
| Factorization - P and Q |
2%
|
25 Points | Medium | HacKSpider | Who ? |
| Known plaintext - encrypted picture |
7%
|
20 Points | Medium | Ryscrow | Who ? |
| Pixel Madness |
5%
|
25 Points | Medium | Ryscrow | Who ? |
| Polybe |
2%
|
25 Points | Medium | koma, Armel | Who ? |
| Vigenère |
7%
|
25 Points | Medium | Arod | Who ? |
| Math-o-crypto |
1%
|
50 Points | Hard | CyberSee | Who ? |


Challenge Results
| Pseudo | Challenge | Date |
| Jos18 | ASCII, Cryptanalyse | 18 May 2012 at 15:43:23 |
| bens60 | César, Cryptanalyse | 18 May 2012 at 13:32:38 |
| rallus | Message Digest 5, Cryptanalyse | 18 May 2012 at 12:24:30 |
| rallus | César, Cryptanalyse | 18 May 2012 at 12:23:25 |
| dexter-hacker | Message Digest 5, Cryptanalysis | 17 May 2012 at 21:13:02 |
| Ducky59 | Vigenère, Cryptanalysis | 16 May 2012 at 21:22:03 |
| Kratisto | Vigenère, Cryptanalysis | 16 May 2012 at 21:21:36 |
| Ducky59 | Cesar, Cryptanalysis | 16 May 2012 at 17:51:21 |
| Ducky59 | Protected archive, Cryptanalysis | 16 May 2012 at 17:24:21 |
| Ducky59 | UUencoding, Cryptanalysis | 16 May 2012 at 17:17:40 |