Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

644 Challengers 1%

Note  Notation

1
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5
57 Votes

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 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang date
jrjgjk   Service - Hash length extension attack 24 February 2021 at 14:44
Mhd_Root   Service - Hash length extension attack 23 February 2021 at 21:50
Pierre   Service - Hash length extension attack 17 February 2021 at 23:01
amit-choudhari   Service - Hash length extension attack 16 February 2021 at 04:31
themaks   Service - Hash length extension attack 14 February 2021 at 18:40
Doc Secure   Service - Hash length extension attack 14 February 2021 at 00:18
ber98fa4a   Service - Hash length extension attack 13 February 2021 at 16:57
molegral   Service - Hash length extension attack 13 February 2021 at 15:04
cow13   Service - Hash length extension attack 10 February 2021 at 17:12
Yousef   Service - Hash length extension attack 9 February 2021 at 19:58

 50 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution
pas_valide Encoding - ASCII 26% 54093 5 Xartrick 10
pas_valide Encoding - UU 21% 42389 5 g0uZ 10
pas_valide Hash - Message Digest 5 21% 42706 5 g0uZ 6
pas_valide Hash - SHA-2 11% 21995 5 koma 4
pas_valide Shift cipher 7% 13424 10 m31z0nyx 9
pas_valide Pixel Madness 6% 10528 15 Ryscrow 10
pas_valide ELF64 - PID encryption 3% 5599 15 Lu33Y 10
pas_valide File - PKZIP 4% 7906 15 g0uZ 6
pas_valide Monoalphabetic substitution - Caesar 5% 9981 15 Arod 4
pas_valide Known plaintext - XOR 3% 5964 20 Ryscrow 5
pas_valide Code - Pseudo Random Number Generator 2% 2321 20 Tosh 5
pas_valide File - Insecure storage 1 3% 6225 20 g0uZ 6
pas_valide Polyalphabetic substitution - Vigenère 4% 6610 20 Arod 3
pas_valide System - Android lock pattern 3% 4363 20 Silentd 4
pas_valide Transposition - Rail Fence 2% 4036 20 YellowS4 3
pas_valide AES - CBC - Bit-Flipping Attack 1% 754 25 Tie21 2
pas_valide AES - ECB 1% 1677 25 cez40 4
pas_valide LFSR - Known plaintext 1% 510 25 Brissouille 1
pas_valide RSA - Factorisation 2% 2825 25 HacKSpider 5
pas_valide RSA - Decipher Oracle 1% 965 25 Zweisamkeit 3
pas_valide Service - Timing attack 1% 1861 25 g0uZ, koma 4
pas_valide Monoalphabetic substitution - Polybe 2% 2352 25 koma 6
pas_valide Twisted secret 1% 134 25 NonStandardModel 1
pas_valide Initialisation Vector 1% 1278 25 manticore, notfound404 5
pas_valide GEDEFU 1% 417 30 makhno 1
pas_valide RSA - Corrupted key 1 1% 240 30 blackndoor 2
pas_valide RSA - Continued fractions 1% 951 30 sambecks 1
pas_valide RSA - Common modulus 1% 1025 30 franb 2
pas_valide Service - Hash length extension attack 1% 644 30 koma 1
pas_valide AES - 4 Rounds 1% 169 35 Cryptanalyse 0
pas_valide ECDSA - Introduction 1% 141 35 Jrmbt 2
pas_valide RSA - Padding 1% 184 35 Tosh 0
pas_valide RSA - Signature 1% 74 35 s4r 1
pas_valide AES128 - CTR 1% 478 40 Tosh 2
pas_valide Discrete logarithm problem 1% 703 40 Thanat0s, RFC4949 3
pas_valide RSA - Corrupted key 2 1% 160 40 blackndoor 0
pas_valide RSA - Corrupted key 3 1% 80 40 blackndoor 0
pas_valide RSA - Multiple recipients 1% 853 40 franb 3
pas_valide AES - Fault attack #1 1% 91 50 Cryptanalyse 1
pas_valide Enigma Machine 1% 157 50 peyman 2
pas_valide ECDHE 1% 153 60 Tosh 2
pas_valide RSA - Lee cooper 1% 74 60 blackndoor, Synacktiv 1
pas_valide Service - CBC Padding 1% 833 60 koma 1
pas_valide Polyalphabetic substitution - One Time Pad 1% 306 60 Thanat0s 0
pas_valide White-Box Cryptography 1% 117 60 Cryptanalyse 3
pas_valide AES - Weaker variant 1% 77 70 Cryptanalyse 1
pas_valide Hash - SHA-3 1% 86 75 Revenger 1
pas_valide AES - Fault attack #2 1% 67 80 Cryptanalyse 1
pas_valide AES-PMAC 1% 12 100 Cryptanalyse 0
pas_valide ECDSA - Implementation error 1% 22 100 Tosh 0