Forelesning 2d - Cryptography (Digital Signature)
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The three Components of Digital Signing
- key generation - signing procedure (private) - verification procedure (public)
What are the Basic Operations of a Digital Signature?
Bare du kan signere, alle andre kan dekryptere Men denne brukes ikke i praksis, man signerer bare en hash-value.
What is Non-Repudiation?
Getting at third party to verify that the information is sent by the claimed sender. A MAC cannot be used, since one can send message to oneself.
Problem med Practical digital signature based on hash value
Hash-funksjonen må ha god collision resistance.
Explain Practical digital signature based on hash value
Signing means encrypting the message with ones private key.
