Visual Cryptography Methods as a Source of Trustworthiness for the Signature Creation and Verification Systems

Abstract

The trusted presentation of the signed or being signed data is one of the key problem, which should be solved in so called secure signature creation and verification devices. Such presentation (in literature respectively known as a What You See Is What You Sign (WYSIWYS) and What You See Was Signed (WYSWS) problems) is the crucial issue especially in distributed environment. The trust assigned to various elements of such environment is limited so the participation of the commonly accepted Trusted Party (TP) operating on-line is the solution of that problem [1, 2]. The paper contains proposal of some modification of the secure signature creation and verification protocol, which was presented by W. Chocianowicz, et al. [1, 2]. The modification is made in the part related to the trusted presentation of the data, which should be signed by the signer or validated by the verifier. The modification is based on the visual cryptography methods allowing the human to verify the authenticity of the data being signed or signed, without any knowledge of cryptography, cryptographic computations, or computational devices.