Cryptanalysis

Break encryption algorithms

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 48 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 39790 5 Xartrick 10
pas_valide Encoding - UU 20% 31539 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 32274 5 g0uZ 6
pas_valide Hash - SHA-2 11% 16153 5 koma 4
pas_valide Shift cipher 7% 9649 10 m31z0nyx 6
pas_valide Pixel Madness 5% 7725 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 4396 15 Lu33Y 10
pas_valide File - PKZIP 4% 5703 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 7378 15 Arod 4
pas_valide Known plaintext - XOR 3% 4580 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1724 20 Tosh 5
pas_valide File - Insecure storage 1 4% 5004 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4985 20 Arod 3
pas_valide System - Android lock pattern 3% 3196 20 Silentd 3
pas_valide Transposition - Rail Fence 2% 3012 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 348 25 Tie21 1
pas_valide AES - ECB 1% 1267 25 cez40 4
pas_valide LFSR - Known plaintext 1% 268 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2082 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 584 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1490 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1720 25 koma 6
pas_valide Initialisation Vector 1% 941 25 manticore, notfound 4
pas_valide GEDEFU 1% 304 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 138 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 719 30 sambecks 1
pas_valide RSA - Common modulus 1% 675 30 franb 2
pas_valide Service - Hash length extension attack 1% 441 30 koma 1
pas_valide AES - 4 Rounds 1% 106 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 55 35 Jrmbt 0
pas_valide RSA - Padding 1% 134 35 Tosh 0
pas_valide AES128 - CTR 1% 390 40 Tosh 1
pas_valide Discrete logarithm problem 1% 515 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 97 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 35 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 603 40 franb 3
pas_valide AES - Fault attack #1 1% 52 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 110 50 peyman 1
pas_valide ECDHE 1% 119 60 Tosh 2
pas_valide RSA - Lee cooper 1% 15 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 633 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 264 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 89 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 36 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 60 75 Revenger 1
pas_valide AES - Fault attack #2 1% 34 80 Cryptanalyse 0
pas_valide AES-PMAC 1% 8 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 12 100 Tosh 0

Challenge Results Challenge Results

Pseudo Challenge Lang date
tibooo   Encodage - UU fr 13 November 2019 at 00:35
tibooo   Encodage - ASCII fr 13 November 2019 at 00:31
Limoniak   Encodage - ASCII fr 13 November 2019 at 00:01
Kokoon   Encodage - ASCII fr 12 November 2019 at 23:57
Cadre   Shift cipher en 12 November 2019 at 23:44
Cadre   Hash - Message Digest 5 en 12 November 2019 at 23:31
Nour Bouhrizi   Encodage - UU fr 12 November 2019 at 23:28
Doothrat   Encodage - ASCII fr 12 November 2019 at 23:23
Tiago   Encoding - ASCII en 12 November 2019 at 23:17
Fokyng   Hash - Message Digest 5 fr 12 November 2019 at 23:13