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2013•Unpublished venueRequires access

Related-Key Square Attack on AES-192

Zhang Yue-yu

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Abstract

This paper investigates weaknesses in key schedule by exploiting appropriate related-key differences of AES-192.The exact subkey differences in the first 8 round can be confirmed,moreover,a part of secrete key can be deduced by the key bridging technique in Asiacrypt'2010.This paper presents a new method for related-key Square attack on 7-round and 8-round AES-192 with weaknesses in key schedule.This attack on the 8-round AES-192 by the balance of Square attack requires about 244.5 chosen plaintexts,244.5 memory,and 2183.5 8-round AES-192 encryptions.Furthermore,this new attack combined with partial sum technique requires about 244.2 chosen plaintexts,244.2 memory,and 2169.2 8-round AES-192 encryptions.

About this research paper

What this paper is about

This paper investigates weaknesses in key schedule by exploiting appropriate related-key differences of AES-192.The exact subkey differences in the first 8 round can be confirmed,moreover,a part of secrete key can be deduced by the key bridging technique in Asiacrypt'2010.This paper presents a new method for related-key Square attack on 7-round and 8-round AES-192 with weaknesses in key schedule.This attack on the 8-round AES-192 by the balance of Square attack requires about 244.5 chosen plaintexts,244.5 memory,and 2183.5 8-round AES-192 encryptions.Furthermore,this new attack combined with partial sum technique requires about 244.2 chosen plaintexts,244.2 memory,and 2169.2 8-round AES-192 encryptions.

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Available abstract

This paper investigates weaknesses in key schedule by exploiting appropriate related-key differences of AES-192.The exact subkey differences in the first 8 round can be confirmed,moreover,a part of secrete key can be deduced by the key bridging technique in Asiacrypt'2010.This paper presents a new method for related-key Square attack on 7-round and 8-round AES-192 with weaknesses in key schedule.This attack on the 8-round AES-192 by the balance of Square attack requires about 244.5 chosen plaintexts,244.5 memory,and 2183.5 8-round AES-192 encryptions.Furthermore,this new attack combined with partial sum technique requires about 244.2 chosen plaintexts,244.2 memory,and 2169.2 8-round AES-192 encryptions.

Key concepts: Computer science, Key (lock), Computer security, Key schedule, Watermarking attack, Schedule, Cryptanalysis, Cryptography

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