A security architect is designing a solution for a financial transaction system that requires proof of the sender's identity and prevents the sender from denying they sent a message. Which security pillar is the architect primarily addressing?
Authenticity
Integrity
Nonrepudiation
Confidentiality
The correct answer is nonrepudiation. Nonrepudiation is the security pillar that provides assurance that someone cannot deny the validity of something. In the context of financial transactions, nonrepudiation mechanisms ensure that the sender of a message cannot later deny having sent it. This is typically accomplished through digital signatures, timestamps, audit trails, and other cryptographic techniques that bind an action to the identity who performed it.
Authenticity primarily indicates verification that something is genuine or from the purported source, not preventing denial of sending. Confidentiality focuses on protecting data from unauthorized access. Integrity ensures data remains unchanged in transit or storage. Availability ensures systems and data are accessible when needed. None of these other pillars directly address preventing the sender from denying their actions.
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