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What kind of certificate is used to validate a user identity?
Correct Answer: A
Explanation/Reference: Explanation: In cryptography, a public key certificate (or identity certificate) is an electronic document which incorporates a digital signature to bind together a public key with an identity - information such as the name of a person or an organization, their address, and so forth. The certificate can be used to verify that a public key belongs to an individual. Incorrect Answers: B: In computer security, an authorization certificate (also known as an attribute certificate) is a digital document that describes a written permission from the issuer to use a service or a resource that the issuer controls or has access to use. C: A root certificate is an unsigned or a self-signed public key certificate that identifies the Root Certificate Authority (CA). D: Code signing digitally signs executables and scripts to verify the software author and guarantee that the code has not been changed or tainted since it was signed by use of a cryptographic hash. References: http://en.wikipedia.org/wiki/Attribute_certificate http://en.wikipedia.org/wiki/Public_key_certificate https://en.wikipedia.org/wiki/Root_certificate https://en.wikipedia.org/wiki/Code_signing