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Training Camp • Cybersecurity Glossary
Inability to deny. In cryptography, a service that ensures the sender cannot deny a message was sent, the integrity of the message is intact, and the receiver cannot claim receiving a different message.
Non-Repudiation Definition: Inability to deny. In cryptography, a service that ensures the sender cannot deny a message was sent, the integrity of the message is intact, and the receiver cannot claim receiving a different message.
Inability to deny. In cryptography, a service that ensures the sender cannot deny a message was sent, the integrity of the message is intact, and the receiver cannot claim receiving a different message. Non-repudiation provides proof of the origin, submission, delivery, and integrity of data, preventing parties from falsely denying their involvement in a transaction or communication. This security service is essential in e-commerce, legal communications, and regulated environments. Non-repudiation is addressed in standards like ISO 27001, NIST SP 800-53, and various industry-specific frameworks. Organizations implement non-repudiation through digital signatures, secure timestamping, trusted third parties, audit logs, and PKI infrastructure. For example, a contract management system might implement non-repudiation by requiring signatories to apply digital signatures using private keys tied to their verified identities, with each signature accompanied by a trusted timestamp and the entire process recorded in tamper-evident audit logs. Related terms: Digital signatures, PKI, Message integrity, Authentication, Audit trail, Trusted timestamping, Evidence.
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