Certified Ethical Hacker (CEH v10) — Question 7

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?

Answer options

• A. Confidentiality
• B. Integrity
• C. Non-Repudiation
• D. Authentication

Correct answer: C

Explanation

The correct answer is C, Non-Repudiation, as it ensures that Bob cannot deny having sent the email, providing proof of his action. Options A and B are incorrect because confidentiality relates to protecting information from unauthorized access, and integrity focuses on ensuring data accuracy, neither of which directly addresses the issue of Bob's denial. Option D, Authentication, verifies identities but does not provide evidence of actions taken by the sender.