Digital signature & certificate

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The presentation is about Digital signature, Digital certificates to be used for Signing documents.

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Digital signature & certificate

  1. 1. BY: Rishikesh Somshetti
  2. 2. ALICE ENCRYPTION PROCESS PZMSY DECRYPTION PROCESS ALICE
  3. 3. Message Message “Secret” Key ENCRYPT (LOCK) (Sender) Ciphertext DECRYPT (UNLOCK) (Receiver) Ciphertext
  4. 4. Cleartext Cleartext Public Key Private Key ENCRYPT (LOCK) Ciphertext (Sender) DECRYPT (UNLOCK) Ciphertext (Receiver)
  5. 5. • • • 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
  6. 6.     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
  7. 7. User Certificate User Name & other credentials Certificate Request User’s Public key Public Private Key pair Generation Public Serial No. Certificate Database User Name Signed by using CA’s private key User’s Email Address User’s Public Key Publish License issued by CCA User 1 certificate CA’s Name Certificate Class Validity Digital Signature of CA User 2 certificate . Web site of CA
  8. 8.      Uses secure hash algorithm Condenses message to 160 bit Key size 512-1024 bits Proposed by NIST in 1991 Adopted
  9. 9. Hardware tokens Soft Token Smart card
  10. 10. AUTHENTICATION INTEGRITY NONREPUDIATION
  11. 11. Paper signatures v/s Digital Signatures 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 Nonrepudiation a. V/s b. Handwriting a. expert needed Error prone b. Any computer user Error free
  12. 12. NetGains Technologies Pvt. Ltd. 708/709, Corporate Avenue, Sonawala Lane, Goregaon East, Mumbai – 400 063. Ph: +91-22-6139 7100 www.netgainstechnologies.com

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