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Table Of Contents  CertiGuide to Security+
 9  Chapter 4:  Basics of Cryptography (Domain 4.0; 15%)
      9  4.2  Concepts in Using Cryptography
           9  4.2.4  Non-Repudiation

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4.2.4  Non-Repudiation
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4.2.5  Access Control
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4.2.4.1  Digital Signatures

A more efficient way to prove message origin is, as with data integrity, to use a digital signature. Remember that a digital signature is a message digest encrypted with the sender’s private key, which is used by a document’s receiver to verify that:

  • The message has not been tampered with since it was signed (data integrity).

  • The person who supposedly sent the message really did (this is non-repudiation).

A receiver may wish the verification of a public key, to make sure that the public key they have really is assigned to the person claiming to have sent the message. This is done through the Public Key Infrastructure, using certificates, described in the next major section.


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4.2.4  Non-Repudiation
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4.2.5  Access Control
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