An encrypted message is sent using PKI from Sara, a client, to a customer. Sara claims she never sent the message. Which of the following aspects of PKI BEST ensures the identity of the sender?

The correct answer is B. Non-repudiation. Non-repudiation in PKI means a sender cannot credibly deny having sent a message. When Sara signs a message with her private key, only she has access to that key, so the digital signature proves she was the sender. A CRL (A) is used to revoke compromised certificates. Trust model

General security concepts

Question

Options

ACRL
BNon-repudiation
CTrust models
DRecovery agents

How the community answered

(40 responses)

A
3% (1)
B
90% (36)
C
3% (1)
D
5% (2)

Explanation

Non-repudiation in PKI means a sender cannot credibly deny having sent a message. When Sara signs a message with her private key, only she has access to that key, so the digital signature proves she was the sender. A CRL (A) is used to revoke compromised certificates. Trust models (C) define how certificate authorities relate to each other. Recovery agents (D) are used to recover encrypted data when a private key is lost. Non-repudiation directly addresses the scenario where a sender attempts to deny authorship.

Topics

#PKI#non-repudiation#digital signatures#public key infrastructure

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