CISSP Practice question #94

What does digital signatures provide?
A: Confidentiality.
B: Availability.
C: Non-repudiation.
D: Authentication.

CBK 3: Security Engineering
Source: practice tests


C: Digital Signatures: Provides Integrity and Non-Repudiation.

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  1. Not A as the encrypted portion is intended to be decrypted by all (the hash).
    Not B as crypto doesn’t lend itself to availability.
    Not D as a DS is an integrity mechanism not usually authentication.
    It is C, a DS provides two functions if verifiable:
    1) We know who sent it, which is C
    2) We know if it has been tampered with/altered.

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