Question

Which specific cryptographic mechanism allows a sender to provide non-repudiation for a digital transaction that cannot be later denied?

Accepted Answer

The specific cryptographic mechanism that ensures non-repudiation is the digital signature. A digital signature is created using asymmetric cryptography, a system that relies on a mathematically linked pair of keys consisting of a public key, which is shared openly, and a private key, which is kept secret by the owner. To sign a transaction, the sender processes the data through a hash function—a mathematical process that produces a unique, fixed-length fingerprint of the data—and then encrypts that fingerprint using their private key. Because only the sender possesses their unique private key, the resulting signature acts as an indelible proof of origin that anyone can verify using the sender’s public key. Think of this like a wax seal on a document: anyone can see the seal to confirm it came from the owner, but only the owner possesses the specific ring required to create the impression. Because the signature is cryptographically bound to both the sender’s identity and the exact contents of the transaction, the sender cannot later claim they did not sign the message, effectively preventing them from denying their participation in the transaction.

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Which specific cryptographic mechanism allows a sender to provide non-repudiation for a digital transaction that cannot be later denied?

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