previous |
start |
next
Digital Signatures
These are a form of authentication applied to electronic documents.
They have three basic functions:
- The receiver can verify the claimed identity of the sender
- The sender cannot later repudiate the contents of the
message
- The receiver cannot possibly have concocted the message
himself
Public key cryptosystems can provide authentication if, in
addition to:
P = D ( E ( iP ) )
we also have:
P = E ( D ( P ) )
This is true for RSA. In this case, we can do:
previous |
start |
next