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This book discuss one of the most interest issues in the security of information field which is the digital signature as we Know the various aspects of keeping our information secret became very important section in the field of information security specially at the end of the last century and the begging of this one as the wide spread of digital data transmission services and the huge using of network and the internet in our personal and economic lives, The focus area in this book is RSA digital signature algorithms (key generation , signature generation and verification process) as if it the main issue of the book but the classification of cryptography has been considered especially the public key cryptography since it provide digital signature and authentication services for which we bound for it a brief notations and discussions , A list of references has been mentioned to easily access for the reader who may pursue particular aspects in greater depth.
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