Non-Repudiation

n the realm of digital communication, the security principle that ensures that a sender cannot deny having sent a message, and a recipient cannot deny having received it, is non-repudiation.

Non-Repudiation:

• Definition: Non-repudiation is a security service that provides proof of the origin or delivery of data and the integrity of the data at a particular time. It prevents either the sender or the receiver from denying having sent or received a message, respectively.

• Key Aspects:

  • Sender's Perspective: Non-repudiation ensures that the sender cannot later deny having sent a message. This is typically achieved through mechanisms such as digital signatures, which authenticate the sender's identity and ensure the integrity of the message.

  • Recipient's Perspective: From the recipient's perspective, non-repudiation ensures that the recipient cannot deny having received a message. This is often achieved through delivery receipts or acknowledgment mechanisms that provide evidence of message receipt.

• Implementation:

  • Digital Signatures: Used to authenticate the sender and ensure message integrity. They provide a cryptographic proof of the sender's identity and that the message has not been altered.

  • Receipts or Acknowledgments: Used to confirm message delivery and provide evidence that the recipient has received the message.