Definition: Non-Repudiation refers to the verification of the identities of individuals or companies who are participating in a telecommunications session. This capability is an information assurance concept equal to the other essential information assurance characteristics that are vital to maintaining business continuity (i.e. confidentiality, integrity and availability). The main purpose of authenticating identities online is to prevent one party or the other from denying the transaction. One of the techniques used to provide the authenticity of the transaction is the use of ditigal signatures.

Its Relevance: Being able to establish, with certainty, the legitimacy of all parties in an electronic commerce transaction is an absolute necessity. Doing so makes online business and commerce possible. All transactions would, otherwise, be questionable without the ability to assure identities. This characteristic of information is essential. Confidence in electronic commerce would be severely hampered. .

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