TAILIEUCHUNG - Authentication Methods: From Digital Signatures to Hashes

We have looked at confidentiality services, and also examined the information theoretic framework for security. Confidentiality between Alice and Bob only guarantees that Eve cannot read the message, it does not address: Is Alice really talking to Bob? Is Bob really talking to Alice? In this lecture, we will look at the following problems: Entity Authentication: Proof of the identity of an individual Message Authentication: (Data origin authentication) Proof that the source of information really is what it claims to be Message Signing: Binding information to a particular entity Data Integrity: Ensuring that information has not been altered by unknown entities . | Authentication Methods: From Digital Signatures to Hashes Lecture Motivation We have looked at confidentiality services, and also examined the information theoretic framework for security. Confidentiality between Alice and Bob only guarantees that Eve cannot read the message, it does not address: Is Alice really talking to Bob? Is Bob really talking to Alice? In this lecture, we will look at the following problems: Entity Authentication: Proof of the identity of an individual Message Authentication: (Data origin authentication) Proof that the source of information really is what it claims to be Message Signing: Binding information to a particular entity Data Integrity: Ensuring that information has not been altered by unknown entities Lecture Outline Discrete Logarithms and ElGamal Primitive elements and some more number theory (quickly) DLOG ElGamal, another Public Key Algorithm Digital Signatures: The basic idea RSA Signatures and ElGamal Signatures Inefficiencies: Hashing and .

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• From Digital Signatures to Hashesnetwork security
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