12-05-2011, 12:47 PM
digital signature.ppt (Size: 271 KB / Downloads: 170)
Document Digital SignatureAbstract/scope
Provide signature mechanism
Provide verification/validation
mechanism
Provide signature attributes
Allows direct access to document
Steps…
Key Generation
Random Numbers
Digital Signature
Generate Message Digest [SHA1]
Encrypting Digest using Private Key [Signatures]
Attaching the Signatures to the message.
Verification of Signatures
Run the test for Authentication, Integrity and Non repudiation.
Digital Signature Certificate
Public Key Certificate (PKC)
Some Trusted Agency is required which certifies the association of an individual with the key pair.
Certifying Authority (CA)
This association is done by issuing a certificate to the user by the CA
Public key certificate (PKC)
All public key certificates are digitally signed by the CA
Certifying Authority
Must be widely known and trusted