Service - Hash length extension attack

30 Points  

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

284 Challengers 1%

Note  Notation

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30 Votes
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Solution 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
rull3n   Service - Hash length extension attack en 21 May 2018 at 09:01
chrsow   Service - Hash length extension attack en 19 May 2018 at 21:02
grego2612   Service - Hash length extension attack fr 16 May 2018 at 18:38
jojo   Service - Hash length extension attack en 12 May 2018 at 16:27
glicket   Service - Hash length extension attack fr 4 May 2018 at 20:10
govlog   Service - Hash length extension attack en 3 May 2018 at 18:41
binary   Service - Hash length extension attack fr 28 April 2018 at 18:30
Mawash   Service - Hash length extension attack fr 24 April 2018 at 22:41
hops   Service - Hash length extension attack en 23 April 2018 at 20:08
Nics   Service - Hash length extension attack en 14 April 2018 at 15:26

Challenges associated with this section 37 Challenges

Results Challenge's Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 28% 23556 5 Xartrick 10
pas_valide Encoding - UU 22% 18850 5 g0uZ 8
pas_valide Hash - Message Digest 5 23% 19577 5 g0uZ 3
pas_valide Hash - SHA-2 12% 9738 5 koma 2
pas_valide Shift cipher 7% 5757 10 m31z0nyx 5
pas_valide Pixel Madness 6% 4579 15 Ryscrow 8
pas_valide ELF32 - PID encryption 4% 3142 15 Lu33Y 9
pas_valide File - PKZIP 4% 3444 15 g0uZ 5
pas_valide Monoalphabetic substitution - Caesar 6% 4834 15 Arod 4
pas_valide Known plaintext - XOR 4% 3015 20 Ryscrow 4
pas_valide Code - Pseudo Random Number Generator 2% 1152 20 Tosh 3
pas_valide File - Insecure storage 1 5% 3768 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 3324 20 Arod 3
pas_valide System - Android lock pattern 3% 2053 20 Silentd 2
pas_valide Transposition - Rail Fence 3% 1940 20 YellowS4 2
pas_valide AES - ECB 2% 870 25 cez40 4
pas_valide LFSR - Known plaintext 1% 86 25 Brissouille 1
pas_valide RSA - Factorisation 2% 1350 25 HacKSpider 3
pas_valide RSA - Decipher Oracle 1% 277 25 Zweisamkeit 2
pas_valide Service - Timing attack 2% 1091 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1201 25 Armel, koma 5
pas_valide Initialisation Vector 1% 624 25 notfound, manticore 3
pas_valide GEDEFU 1% 192 30 makhno 1
pas_valide RSA - Corrupted key V1 1% 50 30 blackndoor 1
pas_valide RSA - Continued fractions 1% 479 30 sambecks 1
pas_valide RSA - Common modulus 1% 362 30 franb 2
pas_valide Service - Hash length extension attack 1% 284 30 koma 1
pas_valide RSA - Padding 1% 83 35 Tosh 0
pas_valide AES128 - CTR 1% 281 40 Tosh 1
pas_valide Discrete logarithm problem 1% 383 40 Thanat0s, RFC4949 2
pas_valide RSA - Corrupted key V2 1% 34 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 391 40 franb 1
pas_valide Enigma Machine 1% 61 50 peyman 0
pas_valide ECDHE 1% 68 60 Tosh 1
pas_valide Service - CBC Padding 1% 476 60 koma 0
pas_valide Polyalphabetic substitution - One Time Pad 1% 210 60 Thanat0s 0
pas_valide Hash - SHA-3 1% 29 75 Revenger 1