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If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, withing 24 hours on weekdays.
Customer service
All questions about your order, return and delivery must be sent to our customer service team by e-mail at yourstore@yourdomain.com
Sale & Press
If you are interested in selling our products, need more information about our brand or wish to make a collaboration, please contact us at press@yourdomain.com
Digital signature scheme (DSS) can be divided into two categories; ordinary signature (OSS) and functionbased signature (FBS). OSS enables a legal signer to sign an electronic message digitally and allows the owner of the message or signature verifier to check the validity of the resultant signature whereas FBS provides the ordinary signature with some added or extra properties and supports many applications in electronicbased business such as ecash or payments systems, electronic voting and contract signing. In this book, we study cryptographic algorithms or protocols of both OSS and FBS that permits for electronic messages to be signed in such a way that the produced signature is hard to forge, easy to authenticate and impossible to repudiate. Most of the existing digital signature schemes were designed based on a single cryptographic assumption (hard problem) like factoring problem (FP), discrete logarithm problem (DLP), quadratic residue problem (QRP), or elliptic curve discrete logarithm problem (ECDLP). Such schemes offer higher level of security than that schemes based on a single cryptographic assumption .
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