Certified in Risk and Information Systems Control (CRISC) Practice Test

The concept of non-repudiation refers to the assurance that someone cannot deny the validity of something. In the context of encryption, it is essential to establish that the sender of a message is indeed who they claim to be and that the message has not been altered in transit.

Using hashing techniques plays a pivotal role in achieving non-repudiation by the sender. Hashing creates a unique digest of the original message, and when combined with a digital signature, it ensures the integrity and authenticity of the message. When the sender hashes the message and signs the hash with their private key, the recipient can then verify this signature using the sender's public key. This process not only confirms that the message originated from the sender but also that it has not been modified after being sent.

The other options, while related to the broader field of information security, do not directly contribute to non-repudiation by the sender. Correct key distribution is crucial for maintaining the confidentiality and integrity of communication but does not ensure that a sender can’t later deny having sent a particular message. Confidentiality measures protect the information itself from unauthorized access but do not address the accountability of the sender. Maintaining data accessibility focuses on ensuring that data is available when needed, which is essential