| Previous slide | Next slide | Back to the first slide | View Graphic Version |
DSA is used only for digital sigs. DSA is the algorithm and is part of the DSS (Digital Sig Std) is the std. DSA can’t be used for encryption. Basically it works like this - the rcvr uses a public key to verify to a recipient the integrity of the data and the identity of the sender.
Digital sigs provide non-repudiation, I.e. keeps sender from repudiating a previously authenticated msg by claiming that the shared secret was compromised by one of the parties sharing the secret.
Encryption and sigs are often combined:
- Alice signs msg with private key
- Alice encrypts the signed msg with Bob’s public key
- Bob decrypts msg with his private key
- Bob verifies Alice’s sig with her public key
Sigs in RSA - you encrypt with your private key and the recipient of the msg decrypts with your public key.