A security service by which evidence is maintained so that the sender and recipient of data cannot deny having participated in the communication. Referred to individually as non-repudiation of origin and non-repudiation of receipt.

non repudiation

Explanation:

non repudiation establishes that someone cannot deny or contest something since it is confirmed. Non repudiation in security systems involves evidence backed communication in electronic communication where parties cannot deny participation since there is evidence that cannot allow for repudiation of participation such as when one signs a document online.