Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

552 Challengers 1%

Note  Notation

1
2
3
4
5
49 Votes

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 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
urandom   Service - Hash length extension attack 9 July 2020 at 16:47
Nyu   Service - Hash length extension attack 6 July 2020 at 22:57
Ssauw   Service - Hash length extension attack 6 July 2020 at 12:51
yaumn   Service - Hash length extension attack 6 July 2020 at 00:04
Fey   Service - Hash length extension attack 2 July 2020 at 13:18
Quanthor_ic   Service - Hash length extension attack 1 July 2020 at 22:37
DrazZz   Service - Hash length extension attack 1 July 2020 at 11:42
A1CY0N   Service - Hash length extension attack 29 June 2020 at 20:28
x3ttw3   Service - Hash length extension attack 21 June 2020 at 00:56
mp3merlin   Service - Hash length extension attack 9 June 2020 at 22:59

 49 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 47631 5 Xartrick 10
pas_valide Encoding - UU 21% 37510 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 38018 5 g0uZ 6
pas_valide Hash - SHA-2 11% 19385 5 koma 4
pas_valide Shift cipher 7% 11814 10 m31z0nyx 8
pas_valide Pixel Madness 6% 9315 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 5109 15 Lu33Y 10
pas_valide File - PKZIP 4% 7005 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 8942 15 Arod 4
pas_valide Known plaintext - XOR 3% 5384 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2051 20 Tosh 5
pas_valide File - Insecure storage 1 4% 5699 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 5995 20 Arod 3
pas_valide System - Android lock pattern 3% 3866 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 3638 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 576 25 Tie21 1
pas_valide AES - ECB 1% 1518 25 cez40 4
pas_valide LFSR - Known plaintext 1% 428 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2519 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 809 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1713 25 g0uZ, koma 4
pas_valide Monoalphabetic substitution - Polybe 2% 2097 25 koma 6
pas_valide Initialisation Vector 1% 1141 25 manticore, notfound404 5
pas_valide GEDEFU 1% 378 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 194 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 857 30 sambecks 1
pas_valide RSA - Common modulus 1% 884 30 franb 2
pas_valide Service - Hash length extension attack 1% 552 30 koma 1
pas_valide AES - 4 Rounds 1% 143 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 114 35 Jrmbt 1
pas_valide RSA - Padding 1% 160 35 Tosh 0
pas_valide RSA - Signature 1% 55 35 s4r 1
pas_valide AES128 - CTR 1% 446 40 Tosh 1
pas_valide Discrete logarithm problem 1% 612 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 134 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 67 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 760 40 franb 3
pas_valide AES - Fault attack #1 1% 76 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 138 50 peyman 2
pas_valide ECDHE 1% 139 60 Tosh 2
pas_valide RSA - Lee cooper 1% 55 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 766 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 280 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 101 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 46 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 79 75 Revenger 1
pas_valide AES - Fault attack #2 1% 53 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 18 100 Tosh 0