Cryptanalysis

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 associated with this section 34 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 15564 5 Xartrick 14
pas_valide Encoding - UU 23% 12526 5 g0uZ 5
pas_valide Hash - Message Digest 5 24% 13214 5 g0uZ 3
pas_valide Hash - SHA-2 11% 6083 5 koma 3
pas_valide Shift cipher 7% 3831 10 m31z0nyx 11
pas_valide Pixel Madness 6% 2871 15 Ryscrow 12
pas_valide ELF32 - PID encryption 5% 2600 15 Lu33Y 14
pas_valide File - PKZIP 5% 2439 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 7% 3598 15 Arod 5
pas_valide Known plaintext - XOR 4% 2121 20 Ryscrow 11
pas_valide Code - Pseudo Random Number Generator 2% 844 20 Tosh 8
pas_valide File - Insecure storage 1 6% 3066 20 g0uZ 8
pas_valide Polyalphabetic substitution - Vigenère 5% 2523 20 Arod 5
pas_valide System - Android lock pattern 3% 1534 20 Silentd 4
pas_valide Transposition - Rail Fence 3% 1414 20 YellowS4 5
pas_valide AES - ECB 2% 576 25 cez40 3
pas_valide RSA - Decipher Oracle 1% 93 25 Zweisamkeit 3
pas_valide RSA - Factorisation 2% 980 25 HacKSpider 2
pas_valide Service - Timing attack 2% 855 25 g0uZ, koma 8
pas_valide Monoalphabetic substitution - Polybe 2% 966 25 Armel, koma 5
pas_valide Initialisation Vector 1% 459 25 notfound, manticore 3
pas_valide GEDEFU 1% 143 30 makhno 3
pas_valide RSA - Continued fractions 1% 341 30 sambecks 3
pas_valide RSA - Common modulus 1% 181 30 franb 3
pas_valide Service - Hash length extension attack 1% 210 30 koma 3
pas_valide RSA - Padding 1% 53 35 Tosh 1
pas_valide AES128 - CTR 1% 208 40 Tosh 3
pas_valide Discrete logarithm problem 1% 309 40 Thanat0s, RFC4949 7
pas_valide RSA - Multiple recipients 1% 255 40 franb 6
pas_valide Enigma Machine 1% 43 50 peyman 2
pas_valide ECDHE 1% 34 60 Tosh 1
pas_valide Service - CBC Padding 1% 357 60 koma 7
pas_valide Polyalphabetic substitution - One Time Pad 1% 178 60 Thanat0s 2
pas_valide Hash - SHA-3 1% 21 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
Chichmanian Alexandre   Hash - Message Digest 5 fr 24 June 2017 at 21:25
Chichmanian Alexandre   Encodage - UU fr 24 June 2017 at 21:25
Chichmanian Alexandre   Encodage - ASCII fr 24 June 2017 at 21:22
Cirdo   Hash - SHA-2 fr 24 June 2017 at 21:06
Bekker   Hash - SHA-2 en 24 June 2017 at 20:33
qesuto   Hash - SHA-2 en 24 June 2017 at 20:32
Staul   Hash - SHA-2 en 24 June 2017 at 20:00
Indalice   Hash - Message Digest 5 fr 24 June 2017 at 19:54
Indalice   Encodage - UU fr 24 June 2017 at 19:52
Indalice   Encodage - ASCII fr 24 June 2017 at 19:51