Lesson 4

# Digital Signature Schemes and Authentication Protocols

• All Topics
• #### Digital Signature Scheme

RSA digital signature scheme

• RSA idea is also used for signing and verifying a message it is called RSA digital signature scheme.

• Digital signature scheme changes the role of the private and public keys

• Private and public keys of only ...

El-gamal digital signature scheme:

• This scheme used the same keys but a different algorithm

• The algorithm creates two digital signatures, these two signatures, are used in the verification phase.

• The key generation process is the same as that of EI-gamal ...

Schnorr digital signature scheme:

• The problem with EI-gamal digital signature is that P needs to be very large to guarantee that the discrete log problem is interactive. The recommendation is a p of at least 1024 bits. This could make ...

Digital signature standard (DSS)

• DSS uses a digital signature algorithm (DSA) based on the EI gamal scheme with some ideas the schnorr sheme

Where, $S_1, S_2$: signatures

D: alices private key

R: random secret

M: message

(\$e_1, e_2, p, q ...