Service - Hash length extension attack

30 Points  

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

419 Challengers 1%

Note  Notation

1
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5
38 Votes
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Solution 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
BoiteAKlou   Service - Hash length extension attack fr 17 September 2019 at 13:42
Masterfox   Service - Hash length extension attack fr 15 September 2019 at 14:15
La Brosse Adam   Service - Hash length extension attack fr 15 September 2019 at 14:12
Samote   Service - Hash length extension attack fr 12 September 2019 at 12:14
S3v3ru5   Service - Hash length extension attack en 5 September 2019 at 11:56
Knowledge   Service - Hash length extension attack fr 3 September 2019 at 19:38
Alex   Service - Hash length extension attack fr 29 August 2019 at 17:18
vannakk   Service - Hash length extension attack en 26 August 2019 at 18:02
Bizyroth   Service - Hash length extension attack fr 22 August 2019 at 11:30
yokésé   Service - Hash length extension attack fr 20 August 2019 at 17:17

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 Encoding - ASCII 26% 37478 5 Xartrick 10
pas_valide Encoding - UU 21% 29684 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 30417 5 g0uZ 6
pas_valide Hash - SHA-2 11% 15162 5 koma 4
pas_valide Shift cipher 7% 8959 10 m31z0nyx 5
pas_valide Pixel Madness 5% 7247 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 4167 15 Lu33Y 10
pas_valide File - PKZIP 4% 5354 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 5% 6964 15 Arod 4
pas_valide Known plaintext - XOR 3% 4371 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1656 20 Tosh 5
pas_valide File - Insecure storage 1 4% 4856 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 4732 20 Arod 3
pas_valide System - Android lock pattern 3% 3042 20 Silentd 3
pas_valide Transposition - Rail Fence 2% 2877 20 YellowS4 2
pas_valide AES - CBC - Bit-Flipping Attack 1% 317 25 Tie21 1
pas_valide AES - ECB 1% 1205 25 cez40 4
pas_valide LFSR - Known plaintext 1% 243 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2000 25 HacKSpider 4
pas_valide RSA - Decipher Oracle 1% 547 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1459 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1651 25 koma 6
pas_valide Initialisation Vector 1% 897 25 manticore, notfound 3
pas_valide GEDEFU 1% 286 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 122 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 685 30 sambecks 1
pas_valide RSA - Common modulus 1% 636 30 franb 2
pas_valide Service - Hash length extension attack 1% 418 30 koma 1
pas_valide AES - 4 Rounds 1% 93 35 Cryptanalyse 0
pas_valide RSA - Padding 1% 126 35 Tosh 0
pas_valide AES128 - CTR 1% 380 40 Tosh 1
pas_valide Discrete logarithm problem 1% 502 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 92 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 19 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 582 40 franb 3
pas_valide AES - Fault attack #1 1% 47 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 106 50 peyman 1
pas_valide ECDHE 1% 114 60 Tosh 2
pas_valide Service - CBC Padding 1% 621 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 258 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 78 60 Cryptanalyse 2
pas_valide AES - Weaker variant 1% 33 70 Cryptanalyse 0
pas_valide Hash - SHA-3 1% 58 75 Revenger 1
pas_valide AES - Fault attack #2 1% 33 80 Cryptanalyse 0
pas_valide AES-PMAC 1% 8 100 Cryptanalyse 0