EC-Council
312-50V10 · Question #17
312-50V10 Question #17: Real Exam Question with Answer & Explanation
The correct answer is C: Non-Repudiation. Non-repudiation ensures a sender cannot deny having performed an action by providing cryptographic proof of origin.
Question
Bob, your senior colleague, has sent you a mail regarding aa deal with one of the clients. You are requested to accept the offer and you oblige. After 2 days, Bob denies that he had ever sent a mail. What do you want to "know" to prove yourself that it was Bob who had send a mail?
Options
- AConfidentiality
- BIntegrity
- CNon-Repudiation
- DAuthentication
Explanation
Non-repudiation ensures a sender cannot deny having performed an action by providing cryptographic proof of origin.
Common mistakes.
- A. Confidentiality ensures data is accessible only to authorized parties but does not create proof identifying who sent or originated the data.
- B. Integrity ensures data has not been altered in transit but does not address whether the original sender can later deny having sent the message.
- D. Authentication verifies the identity of a party at the time of access but does not create a persistent, undeniable record that prevents later denial of a completed action.
Concept tested. Non-repudiation via digital signatures
Reference. https://csrc.nist.gov/glossary/term/non_repudiation
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