Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

0 Challengers 1%

Note  Notation

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61 Votes

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 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang Date
RedBetta   Service - Hash length extension attack 19 July 2021 at 11:06
vivescere   Service - Hash length extension attack 17 July 2021 at 06:09
Worty   Service - Hash length extension attack 15 July 2021 at 10:58
Bizi   Service - Hash length extension attack 12 July 2021 at 13:25
Anynone   Service - Hash length extension attack 6 July 2021 at 23:07
Yarienkiva   Service - Hash length extension attack 4 July 2021 at 23:32
ᖒᕾᕲᙉᕩᔾ   Service - Hash length extension attack 1 July 2021 at 03:16
Vynom   Service - Hash length extension attack 29 June 2021 at 23:58
razzi94   Service - Hash length extension attack 27 June 2021 at 08:46
Ays   Service - Hash length extension attack 25 June 2021 at 14:43

 56 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date
pas_valide Encoding - ASCII 26% 58415 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 21% 45494 5 g0uZ 10 7 October 2006
pas_valide Hash - DCC 1% 243 5 Shutdown 1 13 July 2021
pas_valide Hash - DCC2 1% 244 5 Shutdown 1 13 July 2021
pas_valide Hash - LM 1% 298 5 Shutdown 1 13 July 2021
pas_valide Hash - Message Digest 5 21% 45560 5 g0uZ 7 31 January 2010
pas_valide Hash - NT 1% 224 5 Shutdown 1 13 July 2021
pas_valide Hash - SHA-2 11% 23474 5 koma 4 3 June 2012
pas_valide Shift cipher 7% 14407 10 m31z0nyx 9 16 February 2011
pas_valide CISCO - Salted Password 1% 13 10 Tidusrose 1 13 July 2021
pas_valide Pixel Madness 6% 11326 15 Ryscrow 10 3 February 2011
pas_valide ELF64 - PID encryption 3% 5864 15 Lu33Y 10 8 February 2012
pas_valide File - PKZIP 4% 8434 15 g0uZ 6 30 August 2010
pas_valide Monoalphabetic substitution - Caesar 5% 10651 15 Arod 5 22 October 2011
pas_valide Known plaintext - XOR 3% 6324 20 Ryscrow 5 3 February 2011
pas_valide Code - Pseudo Random Number Generator 2% 2464 20 Tosh 6 19 December 2012
pas_valide File - Insecure storage 1 3% 6534 20 g0uZ 6 6 February 2012
pas_valide Polyalphabetic substitution - Vigenère 4% 7036 20 Arod 3 26 October 2011
pas_valide System - Android lock pattern 3% 4677 20 Silentd 4 23 December 2012
pas_valide Transposition - Rail Fence 2% 4342 20 YellowS4 3 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 880 25 Tie21 3 17 June 2018
pas_valide AES - ECB 1% 1776 25 cez40 4 29 November 2015
pas_valide LFSR - Known plaintext 1% 572 25 Brissouille 1 28 November 2017
pas_valide RSA - Factorisation 2% 3025 25 HacKSpider 5 12 September 2010
pas_valide RSA - Decipher Oracle 1% 1070 25 Zweisamkeit 3 11 May 2017
pas_valide Service - Timing attack 1% 1981 25 g0uZ 4 28 October 2012
pas_valide Monoalphabetic substitution - Polybe 2% 2540 25 koma 6 6 December 2011
pas_valide Twisted secret 1% 183 25 NonStandardModel 1 14 August 2020
pas_valide Initialisation Vector 1% 1379 25 manticore 5 25 August 2015
pas_valide GEDEFU 1% 436 30 makhno 1 13 September 2016
pas_valide OTP - Implementation error 1% 102 30 Podalirius 2 22 March 2021
pas_valide RSA - Corrupted key 1 1% 266 30 blackndoor 2 28 November 2017
pas_valide RSA - Continued fractions 1% 1012 30 sambecks 1 8 September 2015
pas_valide RSA - Common modulus 1% 1128 30 franb 2 24 December 2016
pas_valide Service - Hash length extension attack 1% 699 30 koma 1 19 August 2015
pas_valide AES - 4 Rounds 1% 190 35 Cryptanalyse 0 5 September 2018
pas_valide ECDSA - Introduction 1% 174 35 Jrmbt 2 22 September 2019
pas_valide RSA - Padding 1% 192 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 88 35 sar 1 9 March 2020
pas_valide AES128 - CTR 1% 504 40 Tosh 2 28 August 2015
pas_valide Discrete logarithm problem 1% 758 40 RFC4949 3 8 June 2014
pas_valide RSA - Corrupted key 2 1% 174 40 blackndoor 1 11 January 2018
pas_valide RSA - Corrupted key 3 1% 92 40 blackndoor 0 5 September 2019
pas_valide RSA - Multiple recipients 1% 930 40 franb 3 29 November 2015
pas_valide AES - Fault attack #1 1% 103 50 Cryptanalyse 1 20 September 2018
pas_valide Enigma Machine 1% 169 50 peyman 2 12 October 2016
pas_valide ECDHE 1% 166 60 Tosh 2 20 November 2016
pas_valide RSA - Lee cooper 1% 82 60 blackndoor 1 7 November 2019
pas_valide Service - CBC Padding 1% 885 60 koma 1 4 October 2012
pas_valide Polyalphabetic substitution - One Time Pad 1% 315 60 Thanat0s 0 2 June 2013
pas_valide White-Box Cryptography 1% 128 60 Cryptanalyse 3 21 October 2018
pas_valide AES - Weaker variant 1% 84 70 Cryptanalyse 1 29 August 2018
pas_valide Hash - SHA-3 1% 111 75 Revenger 1 10 December 2016
pas_valide AES - Fault attack #2 1% 72 80 Cryptanalyse 1 20 September 2018
pas_valide AES-PMAC 1% 16 100 Cryptanalyse 0 26 May 2019
pas_valide ECDSA - Implementation error 1% 27 100 Tosh 0 29 September 2019