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 37 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 23556 5 Xartrick 10
pas_valide Encoding - UU 22% 18850 5 g0uZ 8
pas_valide Hash - Message Digest 5 23% 19577 5 g0uZ 3
pas_valide Hash - SHA-2 12% 9738 5 koma 2
pas_valide Shift cipher 7% 5757 10 m31z0nyx 5
pas_valide Pixel Madness 6% 4579 15 Ryscrow 8
pas_valide ELF32 - PID encryption 4% 3142 15 Lu33Y 9
pas_valide File - PKZIP 4% 3444 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 4834 15 Arod 4
pas_valide Known plaintext - XOR 4% 3015 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1152 20 Tosh 3
pas_valide File - Insecure storage 1 5% 3768 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3324 20 Arod 3
pas_valide System - Android lock pattern 3% 2053 20 Silentd 2
pas_valide Transposition - Rail Fence 3% 1940 20 YellowS4 2
pas_valide AES - ECB 2% 870 25 cez40 4
pas_valide LFSR - Known plaintext 1% 86 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1350 25 HacKSpider 3
pas_valide RSA - Decipher Oracle 1% 277 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 1091 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1201 25 Armel, koma 5
pas_valide Initialisation Vector 1% 624 25 notfound, manticore 3
pas_valide GEDEFU 1% 192 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 50 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 479 30 sambecks 1
pas_valide RSA - Common modulus 1% 362 30 franb 2
pas_valide Service - Hash length extension attack 1% 284 30 koma 1
pas_valide RSA - Padding 1% 83 35 Tosh 0
pas_valide AES128 - CTR 1% 281 40 Tosh 1
pas_valide Discrete logarithm problem 1% 383 40 Thanat0s, RFC4949 2
pas_valide RSA - Corrupted key V2 1% 34 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 391 40 franb 1
pas_valide Enigma Machine 1% 61 50 peyman 0
pas_valide ECDHE 1% 68 60 Tosh 1
pas_valide Service - CBC Padding 1% 476 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 210 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 29 75 Revenger 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
cladium   Encoding - ASCII en 27 May 2018 at 07:50
ponsek   Hash - Message Digest 5 en 27 May 2018 at 06:51
ponsek   Encoding - UU en 27 May 2018 at 06:46
ponsek   Encoding - ASCII en 27 May 2018 at 06:23
707   Hash - Message Digest 5 en 27 May 2018 at 05:52
707   Encoding - UU en 27 May 2018 at 05:23
707   Encoding - ASCII en 27 May 2018 at 05:19
RoboBob   Encodage - UU fr 27 May 2018 at 04:24
RoboBob   Encodage - ASCII fr 27 May 2018 at 04:22
Testtestom   Clair connu - XOR fr 27 May 2018 at 04:20