Intelligent Systems.
Theory and Applications

(Intellektual'nye Sistemy. Teoriya i Prilozheniya)

Abstract

The first and long-standing variant of protecting a document from forgery (it is still used today) is the so-called “living” signature (or facsimile), and a clerical seal. However, nowadays the document flow is mostly electronic, and often with a very large number of documents (electronic trading, bank payment systems, transactions in crypto-currencies, etc.). The digital signature that emerged more then forty years ago works here. As a rule, the core of a digital signature is a function whose value is easily calculated for a given argument value, and the reverse, i.e. calculating the value of an argument given the value of a function is very difficult. The article describes an analogue of a digital signature on a different fundamental basis, using image codes that define them up to affine transformations.

Keywords: digital signature, image, image code, affine transformations, image authentication.