What is the purpose of non-repudiation in security?

Non-repudiation serves a critical role in security by ensuring accountability of actions taken within a system. This concept ensures that an individual or entity cannot deny the authenticity of their signature or the sending of a message. By implementing mechanisms such as digital signatures or secure logging, non-repudiation provides proof of the origin of data, as well as the integrity and authenticity of that data. This is vital for maintaining trust in electronic communications and transactions.

For instance, in financial transactions or contractual agreements, having non-repudiation means that if a party claims they did not authorize a transaction, there is evidence to prove the opposite. This accountability is crucial in preventing disputes and enhancing security by acting as a deterrent against malicious actions. The other options, while important aspects of security, do not directly relate to the concept of non-repudiation.