Service - Hash length extension attack

30 Points  0x0

H(key ∥ message)

Author

koma,  

Level  Difficulty

Validations

1148 Challengers 1%

Note  Notation

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73 Votes

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solutions 1 Solution

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Challenge Results Challenge Results

Pseudo Challenge Lang Date
PredatorMonarch Cryptanalyse  Service - Hash length extension attack fr 11 November 2024 at 12:25
Joan Cryptanalyse  Service - Hash length extension attack fr 7 November 2024 at 23:51
hamza Cryptanalysis  Service - Hash length extension attack en 31 October 2024 at 16:50
johnblack Cryptanalysis  Service - Hash length extension attack en 11 October 2024 at 08:30
vlatoos Cryptanalyse  Service - Hash length extension attack fr 19 September 2024 at 20:21
Dario Cryptanalyse  Service - Hash length extension attack fr 19 September 2024 at 16:00
CeliTop Cryptanalyse  Service - Hash length extension attack fr 8 September 2024 at 13:50
benji12982 Cryptanalyse  Service - Hash length extension attack fr 7 September 2024 at 22:30
EVANGELIAMPPL21073 Cryptanalysis  Service - Hash length extension attack en 1 September 2024 at 04:05
jablonskim Cryptanalysis  Service - Hash length extension attack en 25 August 2024 at 15:26

challenges 70 Challenges

Results Name Validations Number of points  Explanation for the scores Difficulty  Difficulty Author Note  Notation Solution Date
pas_valide Encoding - ASCII 26% 87927 5 Xartrick 10 4 December 2012
pas_valide Encoding - UU 20% 67794 5 g0uZ 10 7 October 2006
pas_valide Hash - DCC 3% 7360 5 Podalirius 1 13 July 2021
pas_valide Hash - DCC2 2% 6821 5 Podalirius 1 13 July 2021
pas_valide Hash - LM 3% 7306 5 Podalirius 1 13 July 2021
pas_valide Hash - Message Digest 5 18% 59913 5 g0uZ 7 31 January 2010
pas_valide Hash - NT 2% 5872 5 Podalirius 1 13 July 2021
pas_valide Hash - SHA-2 10% 31496 5 koma 4 3 June 2012
pas_valide Shift cipher 6% 19920 10 m31z0nyx 10 16 February 2011
pas_valide CISCO - Salted Password 2% 4794 10 Tidusrose 3 13 July 2021
pas_valide Pixel Madness 5% 15587 15 Ryscrow 10 3 February 2011
pas_valide ELF64 - PID encryption 3% 7724 15 Lu33Y 10 8 February 2012
pas_valide File - PKZIP 4% 12526 15 g0uZ 6 30 August 2010
pas_valide Monoalphabetic substitution - Caesar 5% 15858 15 Arod 5 22 October 2011
pas_valide Circular Bit Shift 1% 1118 20 BlackRaven 3 21 March 2023
pas_valide Known plaintext - XOR 3% 8776 20 Ryscrow 5 3 February 2011
pas_valide Code - Pseudo Random Number Generator 1% 3404 20 Tosh 6 19 December 2012
pas_valide Encoding - Codebook 1% 311 20 n3rada 1 21 March 2023
pas_valide File - PKZIP 2 1% 49 20 kevin.mille 1 8 November 2024
pas_valide File - Insecure storage 1 3% 9019 20 g0uZ 7 6 February 2012
pas_valide Polyalphabetic substitution - Vigenère 3% 10054 20 Arod 3 26 October 2011
pas_valide System - Android lock pattern 2% 6631 20 Silentd 5 23 December 2012
pas_valide Transposition - Rail Fence 2% 6213 20 YellowS4 4 6 April 2014
pas_valide AES - CBC - Bit-Flipping Attack 1% 1600 25 Tie21 5 17 June 2018
pas_valide AES - ECB 1% 2590 25 cez40 4 29 November 2015
pas_valide AES - ECB - Copy Paste 1% 258 25 Vozec 1 5 February 2024
pas_valide LFSR - Known plaintext 1% 997 25 Brissouille 2 28 November 2017
pas_valide RSA - Factorisation 2% 4746 25 HacKSpider 5 12 September 2010
pas_valide RSA - Decipher Oracle 1% 1945 25 Zweisamkeit 4 11 May 2017
pas_valide Service - Timing attack 1% 2806 25 g0uZ , koma 4 28 October 2012
pas_valide Monoalphabetic substitution - Polybe 2% 3772 25 koma 6 6 December 2011
pas_valide Twisted secret 1% 467 25 NonStandardModel 1 14 August 2020
pas_valide Initialisation Vector 1% 2138 25 manticore , notfound404 6 25 August 2015
pas_valide Hill Cipher 1% 185 30 LetMeR00t 0 21 March 2023
pas_valide GEDEFU 1% 560 30 makhno 1 13 September 2016
pas_valide OTP - Implementation error 1% 429 30 Podalirius 3 22 March 2021
pas_valide RSA - Corrupted key 1 1% 428 30 blackndoor 2 28 November 2017
pas_valide RSA - Continued fractions 1% 1417 30 sambecks 1 8 September 2015
pas_valide RSA - Common modulus 1% 1945 30 franb 3 24 December 2016
pas_valide Service - Hash length extension attack 1% 1149 30 koma 1 19 August 2015
pas_valide Shamir Secret Sharing - Introduction 1% 259 30 Vozec 1 5 February 2024
pas_valide AES - 4 Rounds 1% 339 35 Cryptanalyse 0 5 September 2018
pas_valide ECDSA - Introduction 1% 305 35 Jrmbt 2 22 September 2019
pas_valide RSA - Padding 1% 281 35 Tosh 0 9 October 2016
pas_valide RSA - Signature 1% 186 35 sar 1 9 March 2020
pas_valide Shamir Secret Sharing - Traitor 1% 66 35 Vozec 1 5 February 2024
pas_valide AES128 - CTR 1% 686 40 Tosh 2 28 August 2015
pas_valide PHP - mt_rand 1% 147 40 NonStandardModel 0 28 March 2022
pas_valide Discrete logarithm problem 1% 1239 40 RFC4949 3 8 June 2014
pas_valide RSA - Corrupted key 2 1% 311 40 blackndoor 1 11 January 2018
pas_valide RSA - Corrupted key 3 1% 182 40 blackndoor 0 5 September 2019
pas_valide RSA - Multiple recipients 1% 1574 40 franb 4 29 November 2015
pas_valide AES - Fault attack #1 1% 183 50 Cryptanalyse 1 20 September 2018
pas_valide FEAL - Differential Cryptanalysis 1% 43 50 Tosh 0 28 March 2022
pas_valide Enigma Machine 1% 251 50 peyman 2 12 October 2016
pas_valide Side Channel - AES : CPA 1% 72 50 cb34 0 28 March 2022
pas_valide ECDHE 1% 234 60 Tosh 2 20 November 2016
pas_valide RSA - H-rabin 1% 78 60 Vozec 0 21 March 2023
pas_valide RSA - Lee cooper 1% 153 60 blackndoor , Synacktiv 1 7 November 2019
pas_valide Service - CBC Padding 1% 1308 60 koma 1 4 October 2012
pas_valide Side Channel - AES : first round 1% 73 60 walafc0 0 28 March 2022
pas_valide Polyalphabetic substitution - One Time Pad 1% 375 60 Thanat0s 0 2 June 2013
pas_valide White-Box Cryptography 1% 230 60 Cryptanalyse 3 21 October 2018
pas_valide AES - Weaker variant 1% 135 70 Cryptanalyse 1 29 August 2018
pas_valide Shamir Secret Sharing - Reduction 1% 35 70 Vozec 0 5 February 2024
pas_valide Hash - SHA-3 1% 154 75 Revenger 1 10 December 2016
pas_valide AES - Fault attack #2 1% 130 80 Cryptanalyse 1 20 September 2018
pas_valide Shamir Secret Sharing - Irreducible ? 1% 26 90 Mister7F 0 5 February 2024
pas_valide AES-PMAC 1% 37 100 Cryptanalyse 0 26 May 2019
pas_valide ECDSA - Implementation error 1% 61 100 Tosh 0 29 September 2019