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 45 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Polyalphabetic substitution - Vigenère 4% 4741 20 Arod 3
pas_valide Monoalphabetic substitution - Caesar 5% 6994 15 Arod 4
pas_valide LFSR - Known plaintext 1% 245 25 Brissouille 1
pas_valide AES-PMAC 1% 8 100 Cryptanalyse 0
pas_valide AES - Fault attack #1 1% 48 50 Cryptanalyse 1
pas_valide AES - Fault attack #2 1% 34 80 Cryptanalyse 0
pas_valide AES - Weaker variant 1% 33 70 Cryptanalyse 0
pas_valide White-Box Cryptography 1% 79 60 Cryptanalyse 2
pas_valide AES - 4 Rounds 1% 93 35 Cryptanalyse 0
pas_valide RSA - Factorisation 2% 2003 25 HacKSpider 4
pas_valide ELF64 - PID encryption 3% 4176 15 Lu33Y 10
pas_valide Discrete logarithm problem 1% 505 40 Thanat0s, RFC4949 3
pas_valide Hash - SHA-3 1% 58 75 Revenger 1
pas_valide Pixel Madness 5% 7272 15 Ryscrow 10
pas_valide Known plaintext - XOR 3% 4380 20 Ryscrow 4
pas_valide System - Android lock pattern 3% 3050 20 Silentd 3
pas_valide Polyalphabetic substitution - One Time Pad 1% 259 60 Thanat0s 0
pas_valide AES - CBC - Bit-Flipping Attack 1% 320 25 Tie21 1
pas_valide ECDHE 1% 114 60 Tosh 2
pas_valide Code - Pseudo Random Number Generator 2% 1659 20 Tosh 5
pas_valide AES128 - CTR 1% 382 40 Tosh 1
pas_valide RSA - Padding 1% 127 35 Tosh 0
pas_valide Encoding - ASCII 26% 37612 5 Xartrick 10
pas_valide Transposition - Rail Fence 2% 2883 20 YellowS4 2
pas_valide RSA - Decipher Oracle 1% 553 25 Zweisamkeit 3
pas_valide RSA - Corrupted key 2 1% 94 40 blackndoor 0
pas_valide RSA - Corrupted key 1 1% 126 30 blackndoor 2
pas_valide RSA - Corrupted key 3 1% 27 40 blackndoor 0
pas_valide AES - ECB 1% 1211 25 cez40 4
pas_valide RSA - Multiple recipients 1% 584 40 franb 3
pas_valide RSA - Common modulus 1% 639 30 franb 2
pas_valide Service - Timing attack 1% 1461 25 g0uZ, koma 3
pas_valide Encoding - UU 21% 29785 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 30513 5 g0uZ 6
pas_valide File - Insecure storage 1 4% 4863 20 g0uZ 5
pas_valide File - PKZIP 4% 5378 15 g0uZ 5
pas_valide Monoalphabetic substitution - Polybe 2% 1659 25 koma 6
pas_valide Service - Hash length extension attack 1% 422 30 koma 1
pas_valide Hash - SHA-2 11% 15229 5 koma 4
pas_valide Service - CBC Padding 1% 622 60 koma 1
pas_valide Shift cipher 7% 9007 10 m31z0nyx 5
pas_valide GEDEFU 1% 288 30 makhno 1
pas_valide Initialisation Vector 1% 902 25 manticore, notfound 3
pas_valide Enigma Machine 1% 106 50 peyman 1
pas_valide RSA - Continued fractions 1% 691 30 sambecks 1

Challenge Results Challenge Results

Pseudo Challenge Lang date
Truoc Phan   Hash - Message Digest 5 en 21 September 2019 at 18:22
Truoc Phan   Encoding - UU en 21 September 2019 at 18:13
Fice   Chiffrement par décalage fr 21 September 2019 at 18:11
Truoc Phan   Encoding - ASCII en 21 September 2019 at 18:06
BoiteAKlou   AES128 - CTR fr 21 September 2019 at 18:03
OLOYA   Chiffrement par décalage fr 21 September 2019 at 18:02
tom   Hash - Message Digest 5 fr 21 September 2019 at 18:01
tom   Encodage - ASCII fr 21 September 2019 at 17:54
Fice   Hash - SHA-2 fr 21 September 2019 at 17:35
Grobatow   AES - Attaque par fautes #2 fr 21 September 2019 at 17:28