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.

 49 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 18 100 Tosh 0
pas_valide AES - Weaker variant 1% 44 70 Cryptanalyse 1
pas_valide RSA - Signature 1% 48 35 s4r 0
pas_valide RSA - Lee cooper 1% 51 60 blackndoor, Synacktiv 0
pas_valide AES - Fault attack #2 1% 52 80 Cryptanalyse 1
pas_valide RSA - Corrupted key 3 1% 63 40 blackndoor 0
pas_valide Hash - SHA-3 1% 73 75 Revenger 1
pas_valide AES - Fault attack #1 1% 74 50 Cryptanalyse 1
pas_valide White-Box Cryptography 1% 99 60 Cryptanalyse 3
pas_valide ECDSA - Introduction 1% 107 35 Jrmbt 1
pas_valide Enigma Machine 1% 127 50 peyman 1
pas_valide RSA - Corrupted key 2 1% 128 40 blackndoor 0
pas_valide ECDHE 1% 136 60 Tosh 2
pas_valide AES - 4 Rounds 1% 138 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 156 35 Tosh 0
pas_valide RSA - Corrupted key 1 1% 186 30 blackndoor 2
pas_valide Polyalphabetic substitution - One Time Pad 1% 277 60 Thanat0s 0
pas_valide GEDEFU 1% 367 30 makhno 1
pas_valide LFSR - Known plaintext 1% 405 25 Brissouille 1
pas_valide AES128 - CTR 1% 442 40 Tosh 1
pas_valide Service - Hash length extension attack 1% 537 30 koma 1
pas_valide AES - CBC - Bit-Flipping Attack 1% 548 25 Tie21 1
pas_valide Discrete logarithm problem 1% 601 40 Thanat0s, RFC4949 3
pas_valide RSA - Multiple recipients 1% 743 40 franb 3
pas_valide Service - CBC Padding 1% 755 60 koma 1
pas_valide RSA - Decipher Oracle 1% 772 25 Zweisamkeit 3
pas_valide RSA - Continued fractions 1% 843 30 sambecks 1
pas_valide RSA - Common modulus 1% 863 30 franb 2
pas_valide Initialisation Vector 1% 1117 25 manticore, notfound404 5
pas_valide AES - ECB 1% 1491 25 cez40 4
pas_valide Service - Timing attack 1% 1683 25 g0uZ, koma 4
pas_valide Code - Pseudo Random Number Generator 2% 2023 20 Tosh 5
pas_valide Monoalphabetic substitution - Polybe 2% 2054 25 koma 6
pas_valide RSA - Factorisation 2% 2474 25 HacKSpider 5
pas_valide Transposition - Rail Fence 2% 3574 20 YellowS4 3
pas_valide System - Android lock pattern 3% 3792 20 Silentd 4
pas_valide ELF64 - PID encryption 3% 5031 15 Lu33Y 10
pas_valide Known plaintext - XOR 3% 5295 20 Ryscrow 5
pas_valide File - Insecure storage 1 4% 5620 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 5889 20 Arod 3
pas_valide File - PKZIP 4% 6848 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 8732 15 Arod 4
pas_valide Pixel Madness 6% 9125 15 Ryscrow 10
pas_valide Shift cipher 7% 11557 10 m31z0nyx 8
pas_valide Hash - SHA-2 11% 18985 5 koma 4
pas_valide Encoding - UU 21% 36686 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 37220 5 g0uZ 6
pas_valide Encoding - ASCII 26% 46496 5 Xartrick 10

Challenge Results Challenge Results

Pseudo Challenge Lang date
Tecmaxters   Encodage - ASCII 27 May 2020 at 11:12
orchas   RSA - Oracle de déchiffrement 27 May 2020 at 11:10
Maxence Lagalle   Encodage - ASCII 27 May 2020 at 10:48
Tata_Yoyo   Encoding - ASCII 27 May 2020 at 10:22
Kinchik14/88   Hash - SHA-2 27 May 2020 at 10:11
Hikaeme   Encodage - ASCII 27 May 2020 at 09:40
Salamandre55   Transposition - Rail Fence 27 May 2020 at 09:36
Kinchik14/88   Encoding - ASCII 27 May 2020 at 09:30
KennedyS   Problème du logarithme discret 27 May 2020 at 08:34
Salamandre55   System - Android lock pattern 27 May 2020 at 08:34