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 44 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 35903 5 Xartrick 10
pas_valide Encoding - UU 21% 28529 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 29232 5 g0uZ 6
pas_valide Hash - SHA-2 11% 14580 5 koma 4
pas_valide Shift cipher 7% 8633 10 m31z0nyx 5
pas_valide Pixel Madness 5% 6963 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 4034 15 Lu33Y 10
pas_valide File - PKZIP 4% 5142 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 6744 15 Arod 4
pas_valide Known plaintext - XOR 4% 4239 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1599 20 Tosh 5
pas_valide File - Insecure storage 1 4% 4740 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4577 20 Arod 3
pas_valide System - Android lock pattern 3% 2928 20 Silentd 3
pas_valide Transposition - Rail Fence 2% 2762 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 264 25 Tie21 1
pas_valide AES - ECB 1% 1160 25 cez40 4
pas_valide LFSR - Known plaintext 1% 213 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1931 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 511 25 Zweisamkeit 3
pas_valide Service - Timing attack 2% 1414 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1588 25 koma 6
pas_valide Initialisation Vector 1% 853 25 manticore, notfound 3
pas_valide GEDEFU 1% 272 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 111 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 659 30 sambecks 1
pas_valide RSA - Common modulus 1% 596 30 franb 2
pas_valide Service - Hash length extension attack 1% 394 30 koma 1
pas_valide AES - 4 Rounds 1% 78 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 119 35 Tosh 0
pas_valide AES128 - CTR 1% 366 40 Tosh 1
pas_valide Discrete logarithm problem 1% 489 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key V2 1% 88 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 558 40 franb 3
pas_valide AES - Fault attack #1 1% 40 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 98 50 peyman 1
pas_valide ECDHE 1% 106 60 Tosh 2
pas_valide Service - CBC Padding 1% 599 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 249 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 66 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 28 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 56 75 Revenger 1
pas_valide AES - Fault attack #2 1% 28 80 Cryptanalyse 0
pas_valide AES-PMAC 1% 4 100 Cryptanalyse 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
vp.x   Chiffrement par décalage fr 17 July 2019 at 07:49
vp.x   Hash - SHA-2 fr 17 July 2019 at 07:41
vp.x   Hash - Message Digest 5 fr 17 July 2019 at 07:38
udoti   Hash - Message Digest 5 en 17 July 2019 at 07:37
vp.x   Encodage - UU fr 17 July 2019 at 07:37
udoti   Encoding - UU en 17 July 2019 at 07:35
huynhminhchu   RSA - Common modulus en 17 July 2019 at 05:02
Zox@   Encodage - ASCII fr 17 July 2019 at 03:28
BOOM   AES - CBC - Bit-Flipping Attack en 16 July 2019 at 23:42
Fernando   Pixel Madness es 16 July 2019 at 23:33