Lecture 6: Digital Signature

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Presentation transcript:

Lecture 6: Digital Signature NET 536 Network Security Networks and Communication Department Lecture 6: Digital Signature

lecture contents: Introduction RSA Digital Signature ElGamal Digital Signature DSA 23-Feb-19 Networks and Communication Department

Networks and Communication Department Introduction Digital signature is a data string which associates a message (in digital form) with some originating entity. Digital signature verification is a method for verifying that a digital signature is authentic (was indeed created by the specific entity). The main difference from a handwritten signature is that digital signature of a message is intimately connected with the message, and for different messages is different, whereas the handwritten signature is adjoined to the message and always looks the same. 23-Feb-19 Networks and Communication Department

Digital Signature Overview Based on asymmetric crypto - Example: RSA Properties of a Digital Signature: Verification of the validity of a digital signature needs only the public key Only the owner of the corresponding private key can produce a valid signature There is also MAC (Message Authentication Code) – signing using a shared key (based on symmetric cryptography) 23-Feb-19 Networks and Communication Department

The Model of Digital Signature 23-Feb-19 Networks and Communication Department

RSA Digital Signature Construction: Rivest, Shamir, and Adleman proposed in 1978. Construction: 1. Choose two large prime numbers P and Q, then compute N=P×Q. 2. Select an integer e such that gcd(e, (N))=1. 3. Compute d such that e×d mod (N)=1. 4. Public key = (N, e). 5. Private key = (P, Q, d). 23-Feb-19 Networks and Communication Department

RSA Digital Signature 23-Feb-19 Networks and Communication Department

RSA Digital Signature Example 23-Feb-19 Networks and Communication Department