Introduction Used for communication to verify

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Presentation transcript:

Introduction Used for communication to verify Authentication of sender/data origin Integrity of the message received Non-repudiation private key for E & public key for D Identification of doc or message etc. For interchanging data electronically

Implementation Scheme has the following 3 algorithm Key generation Signing Verification It includes MAC Hash values of message Digital pen pad device

Digital Signature Standard Digital Signature Algorithm In 1991, NIST proposed DSA to be used in DSS (FIPS PUB 186) Adopted as a standard in 94 In 96, minor revision was issued In 2000, standard was expanded further SHA-1 DSA v/s RSA Free & license DS & DS + Encryption Strength Of Algorithm Computer Security Resource Center NIST(csrc.nist.gov) Federal Information Processing standard

RSA Digital Signature MD Calculation Signing(i.e:-DS Creation) Transmission Of Original Message & DS together Receiver calculates its own MD De-sign digital signature(i.e:-retrieves sender’s MD) Verification(Note:-Same Hash Algo should be used) MD1=MD2 MD1≠MD2