What is the primary purpose of non-repudiation in information security?

The primary purpose of non-repudiation in information security is indeed a guarantee against denial of message sending and receiving. Non-repudiation ensures that an individual or entity cannot deny the authenticity of their signature on a document or the sending of a message that they originated. This is crucial in scenarios such as financial transactions, legal documents, or any communications where accountability is necessary. By providing proof of the origin and integrity of the message, non-repudiation establishes a foundation for trust in electronic communications and transactions.

Data integrity, system availability, and confidentiality are all essential aspects of information security but serve different purposes. Data integrity focuses on ensuring that information is accurate and unaltered during storage and transmission. Protecting system availability involves ensuring that systems are operational and accessible when required. Maintaining confidentiality seeks to protect sensitive information from being disclosed to unauthorized parties. Each of these concepts contributes to the overall security framework but does not directly address the accountability aspect that non-repudiation provides.