1.

Write A Note On Digital Signature?

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Requirement: 

  • To authenticate STORED document files as well as MESSAGES 
  • To protect against FORGERY 
  • To prevent the signer from repudiating a signed document (denying their responsibility) 

Encryption of a document in a secret key constitutes a signature: 

  • IMPOSSIBLE for others to perform without knowledge of the key 
  • Strong authentication of document 
  • Strong protection against forgery 
  • Weak against repudiation (signer could claim key was COMPROMISED).

Requirement: 

Encryption of a document in a secret key constitutes a signature: 


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