Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

506 Challengers 1%

Note  Notation

1
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5
45 Votes

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 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
Mugiwara27   Service - Hash length extension attack 2 April 2020 at 14:47
Black Aether   Service - Hash length extension attack 1 April 2020 at 11:05
cb34   Service - Hash length extension attack 29 March 2020 at 19:23
Ast4te   Service - Hash length extension attack 29 March 2020 at 18:15
Th1b4ud   Service - Hash length extension attack 29 March 2020 at 15:01
g2i   Service - Hash length extension attack 26 March 2020 at 17:46
iThomas   Service - Hash length extension attack 25 March 2020 at 14:07
1-vek   Service - Hash length extension attack 25 March 2020 at 11:14
ex0dus   Service - Hash length extension attack 25 March 2020 at 08:08
WatashiBu   Service - Hash length extension attack 22 March 2020 at 10:45

 49 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 44916 5 Xartrick 10
pas_valide Encoding - UU 21% 35456 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 36052 5 g0uZ 6
pas_valide Hash - SHA-2 11% 18243 5 koma 4
pas_valide Shift cipher 7% 11078 10 m31z0nyx 7
pas_valide Pixel Madness 5% 8795 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 4894 15 Lu33Y 10
pas_valide File - PKZIP 4% 6564 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 8355 15 Arod 4
pas_valide Known plaintext - XOR 3% 5142 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 1946 20 Tosh 5
pas_valide File - Insecure storage 1 4% 5480 20 g0uZ 5
pas_valide Polyalphabetic substitution - Vigenère 4% 5667 20 Arod 3
pas_valide System - Android lock pattern 3% 3627 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 3444 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 494 25 Tie21 1
pas_valide AES - ECB 1% 1451 25 cez40 4
pas_valide LFSR - Known plaintext 1% 368 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2379 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 727 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1618 25 g0uZ, koma 3
pas_valide Monoalphabetic substitution - Polybe 2% 1961 25 koma 6
pas_valide Initialisation Vector 1% 1075 25 manticore, notfound404 5
pas_valide GEDEFU 1% 343 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 170 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 808 30 sambecks 1
pas_valide RSA - Common modulus 1% 822 30 franb 2
pas_valide Service - Hash length extension attack 1% 506 30 koma 1
pas_valide AES - 4 Rounds 1% 126 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 99 35 Jrmbt 1
pas_valide RSA - Padding 1% 150 35 Tosh 0
pas_valide RSA - Signature 1% 31 35 stan1slas 0
pas_valide AES128 - CTR 1% 424 40 Tosh 1
pas_valide Discrete logarithm problem 1% 574 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 117 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 58 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 714 40 franb 3
pas_valide AES - Fault attack #1 1% 69 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 120 50 peyman 1
pas_valide ECDHE 1% 129 60 Tosh 2
pas_valide RSA - Lee cooper 1% 44 60 blackndoor, Synacktiv 0
pas_valide Service - CBC Padding 1% 731 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 273 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 92 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 42 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 73 75 Revenger 1
pas_valide AES - Fault attack #2 1% 49 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 11 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 16 100 Tosh 0