Non-repudiability

**Non-repudiability**: A critical concept in digital security and cryptography, non-repudiability ensures that a party in a communication or transaction cannot deny the authenticity of their signature or the sending of a message. This principle is essential for maintaining trust and accountability in electronic exchanges by providing undeniable proof of participation. Non-repudiability is commonly achieved through digital signatures, timestamps, and audit trails, making it a foundational element in secure online interactions, legal contracts, and financial transactions.