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 43 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 27% 30611 5 Xartrick 10
pas_valide Encoding - UU 21% 24405 5 g0uZ 10
pas_valide Hash - Message Digest 5 22% 25088 5 g0uZ 6
pas_valide Hash - SHA-2 11% 12587 5 koma 3
pas_valide Shift cipher 7% 7437 10 m31z0nyx 5
pas_valide Pixel Madness 6% 6024 15 Ryscrow 10
pas_valide ELF64 - PID encryption 4% 3608 15 Lu33Y 10
pas_valide File - PKZIP 4% 4445 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 5889 15 Arod 4
pas_valide Known plaintext - XOR 4% 3723 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1391 20 Tosh 4
pas_valide File - Insecure storage 1 4% 4342 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4014 20 Arod 3
pas_valide System - Android lock pattern 3% 2541 20 Silentd 3
pas_valide Transposition - Rail Fence 3% 2388 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 139 25 Tie21 1
pas_valide AES - ECB 1% 1015 25 cez40 4
pas_valide LFSR - Known plaintext 1% 147 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1636 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 386 25 Zweisamkeit 3
pas_valide Service - Timing attack 2% 1264 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1402 25 koma 6
pas_valide Initialisation Vector 1% 730 25 manticore, notfound 3
pas_valide GEDEFU 1% 233 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 89 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 578 30 sambecks 1
pas_valide RSA - Common modulus 1% 487 30 franb 2
pas_valide Service - Hash length extension attack 1% 342 30 koma 1
pas_valide AES - 4 Rounds 1% 55 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 107 35 Tosh 0
pas_valide AES128 - CTR 1% 335 40 Tosh 1
pas_valide Discrete logarithm problem 1% 431 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key V2 1% 65 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 488 40 franb 3
pas_valide AES - Fault attack #1 1% 27 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 87 50 peyman 0
pas_valide ECDHE 1% 89 60 Tosh 2
pas_valide Service - CBC Padding 1% 530 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 234 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 47 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 21 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 47 75 Revenger 1
pas_valide AES - Fault attack #2 1% 19 80 Cryptanalyse 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
byFuuRy   Hash - SHA-2 fr 24 January 2019 at 01:30
pipomambo   Substitution polyalphabétique - Vigenère fr 24 January 2019 at 01:16
Rileran   Hash - Message Digest 5 fr 24 January 2019 at 01:04
Rileran   Encodage - UU fr 24 January 2019 at 01:01
winna   Encodage - ASCII fr 24 January 2019 at 00:58
lagoyave   Chiffrement par décalage fr 24 January 2019 at 00:56
Rileran   Encodage - ASCII fr 24 January 2019 at 00:48
lagoyave   Hash - SHA-2 fr 24 January 2019 at 00:44
byFuuRy   Hash - Message Digest 5 fr 24 January 2019 at 00:36
byFuuRy   Encodage - UU fr 24 January 2019 at 00:34