Repudiation : describes a situation where the authenticity of a signature is being challenged.

The term is often seen in a legal setting wherein the authenticity of a signature is being challenged.

The authenticity of a signature arose last year when Darryl Strawberry was accused of failing to report income from autographs and personal appearances.

It manages keys and certificates, and checks the authenticity of signatures.

Unfortunately, the report is inadequate due to the lack of any mechanism to verify the authenticity of signatures.

A second company, the Communication Intelligence Corporation, a publicly traded concern in Redwood Shores, Calif., has developed a signature verification technology that does not use pressure points in determining the authenticity of signatures.

Though officials in the Bahamas have confirmed the existence of the company named in the correspondence, questions have arisen about the authenticity of signatures, and the letters contain misspellings and very awkward syntax, as if written by someone whose native language is not English.