Digital Signature
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Digital signatures provide authentication and integrity for electronic documents and transactions. They use public key cryptography where a document is encrypted with the sender's private key and decrypted by the recipient's public key. A digital certificate issued by a certificate authority binds the signer's identity to their public key and is verified using the CA's digital signature. Common uses of digital signatures include software updates, financial transactions, and legally binding documents.
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Digital Signature
- 3. ENCRYPT ( LOCK ) Message Ciphertext “ Secret” Key DECRYPT ( UNLOCK ) Ciphertext Message (Sender) (Receiver)
- 4. ENCRYPT (LOCK) Cleartext Ciphertext Public Key DECRYPT (UNLOCK) Ciphertext Private Key Cleartext (Sender) (Receiver)
- 6. Digital Identity that establishes your credentials when doing business or other transactions on the Web Issued by a Certifying Authority (CA) Contains your name, serial number, expiration dates, public key, signature of CA
- 7. Trusted Third Party An organization which issues public key certificates Assures the identity of the parties to whom it issues certificates Maintains online access to the public key certificates issued
- 8. Signed by using CA’s private key User Name & other credentials User’s Public key User Certificate Certificate Database Publish Certificate Request Key pair Generation Private Public Web site of CA User 1 certificate User 2 certificate . Public License issued by CCA User Name User’s Public Key CA’s Name Validity Digital Signature of CA Certificate Class User’s Email Address Serial No.
- 9. Uses secure hash algorithm Condenses message to 160 bit Key size 512-1024 bits Proposed by NIST in 1991 Adopted
- 10. Soft Token Hardware tokens Smart card
- 12. Paper signatures v/s Digital Signatures V/s Parameter Paper Electronic Authenticity May be forged Can not be copied Integrity Signature independent of the document Signature depends on the contents of the document Non-repudiation Handwriting expert needed Error prone Any computer user Error free