Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

606 Challengers 1%

Note  Notation

1
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5
53 Votes

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 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
Natsumura   Service - Hash length extension attack 21 November 2020 at 15:26
Laden   Service - Hash length extension attack 16 November 2020 at 10:25
zaikoe   Service - Hash length extension attack 14 November 2020 at 20:16
sirine   Service - Hash length extension attack 13 November 2020 at 15:45
arthemis   Service - Hash length extension attack 11 November 2020 at 21:41
ABH   Service - Hash length extension attack 11 November 2020 at 21:05
shadow75   Service - Hash length extension attack 11 November 2020 at 02:31
lanewa1386   Service - Hash length extension attack 4 November 2020 at 14:43
Alternatif   Service - Hash length extension attack 4 November 2020 at 13:28
Bl00dy   Service - Hash length extension attack 26 October 2020 at 15:29

 50 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 51493 5 Xartrick 10
pas_valide Encoding - UU 21% 40438 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 40834 5 g0uZ 6
pas_valide Hash - SHA-2 11% 20913 5 koma 4
pas_valide Shift cipher 7% 12802 10 m31z0nyx 8
pas_valide Pixel Madness 6% 10059 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 5425 15 Lu33Y 10
pas_valide File - PKZIP 4% 7529 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 9582 15 Arod 4
pas_valide Known plaintext - XOR 3% 5760 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2213 20 Tosh 5
pas_valide File - Insecure storage 1 4% 6005 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 6385 20 Arod 3
pas_valide System - Android lock pattern 3% 4167 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 3854 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 687 25 Tie21 2
pas_valide AES - ECB 1% 1614 25 cez40 4
pas_valide LFSR - Known plaintext 1% 469 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2699 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 899 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1803 25 g0uZ, koma 4
pas_valide Monoalphabetic substitution - Polybe 2% 2258 25 koma 6
pas_valide Twisted secret 1% 94 25 NonStandardModel 1
pas_valide Initialisation Vector 1% 1228 25 manticore, notfound404 5
pas_valide GEDEFU 1% 402 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 220 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 917 30 sambecks 1
pas_valide RSA - Common modulus 1% 964 30 franb 2
pas_valide Service - Hash length extension attack 1% 606 30 koma 1
pas_valide AES - 4 Rounds 1% 160 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 131 35 Jrmbt 2
pas_valide RSA - Padding 1% 176 35 Tosh 0
pas_valide RSA - Signature 1% 66 35 s4r 1
pas_valide AES128 - CTR 1% 465 40 Tosh 1
pas_valide Discrete logarithm problem 1% 665 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 146 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 74 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 820 40 franb 3
pas_valide AES - Fault attack #1 1% 85 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 148 50 peyman 2
pas_valide ECDHE 1% 147 60 Tosh 2
pas_valide RSA - Lee cooper 1% 65 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 806 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 295 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 110 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 56 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 81 75 Revenger 1
pas_valide AES - Fault attack #2 1% 63 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 20 100 Tosh 0