The Effect Of Varying Key Length On A Vigenère Cipher
Journal Title: IOSR Journals (IOSR Journal of Computer Engineering) - Year 2015, Vol 17, Issue 2
Abstract
Abstract: Vigenère cipher is one of the polyalphabetic substitution ciphers. Its weakness is the key repetition.To overcome this weakness there are many researchesgoing on to modify the key generation. In this paper a keygenerator function isimplemented with C++. Itgenerates a key with length depends on the message securitylevel.This level is determined by the sender of the message, according to the security importance of the message.The security level determines the key length, which is a ratio from the plain-text message. This ratio varies from10% to 100% from the plain-text length. This paper studies the effect of varying the key length on theperformance of Vigenère cipher andits frequency analysis attack. When the key length increases the encryptionand decryption time increases, the frequency analysis attack becomes more difficult and also the confusion isincreased
Authors and Affiliations
Ayman Al-ahwal , Sameh Farid
Keywords
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