Overview of Digital Signatures Introduction To Networks and Communications (CS 555) Presented by Bharath Kongara.

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Presentation transcript:

Overview of Digital Signatures Introduction To Networks and Communications (CS 555) Presented by Bharath Kongara

What is a Digital Signature? An electronic signature that can be used to authenticate the identity of the sender of a message or the signer of a document.

Why Digital Signatures? To Provide Authenticity, Non-Repudiation and Integrity to electronic documents To use internet as the safe and secure medium for e-Commerce and e-Governance

Digital Signatures Each individual generates his own key pair ( Public key known to everyone and private key only to the owner) Private key - Used for making digital owner Public key – Used to verify the digital signature

How it works? Step 1: Getting a Private and Public Key Step 2: Signing an Electronic Document Initiate the signing process Create a digital signature Append the signature to the document

How it works? Step 3: Validating a Digital Signature (Receiver Side) Initiate the validation process Decrypt the digital signature Compares the document fingerprint with the calculated one

What is a Digital Certificate and who issues it? A digital certificate is an electronic document that uses a digital signature to bind together a public key with an identity. The CA issues an encrypted digital certificate containing the sender’s public key and a variety of other identification information.

Message Digest Data to be encoded -> Message Hash value(Message)->Message Digest or Digest Hash Functions MD4 MD5 SHA-1 SHA-2 are generally used

Uses of Digital Signature and Overall Function Authentication Integrity Non-repudiation

References digital-signature-ccapresentation-1-science-technology-ppt- powerpoint/

Thank You