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3.9.5 (EMAIL SECURITY ISSUES (security issues involved in emails (•…

- - - - a digital signature authenticates a transmission from a
        user in an untrusted network environmen
      - good method of securing email
        transmissions because:
        
        • The signature cannot be forged.
        
        • The signature is authentic and encrypted.
        
        • The signature cannot be reused (a signature on one document cannot be transferred to another document).
        
        • The signed document cannot be altered; any alteration to the document(whether or not it has been encrypted) renders the signature invalid
      - Digital signatures are based on a procedure called message digesting, which computes a short, fixed-length number called a digest for any message of any length.
        
        message digest is a cryptographically strong, one-way hash function of the message.
        
        It is similar to a checksum in that it compactly represents the message and is used to detect changes in the message.