Optimal Correspondence of String Subsequences
IEEE Transactions on Pattern Analysis and Machine Intelligence
Digital signature algorithm for securing digital identities
Information Processing Letters
Handbook of Bar-Coding Systems
Handbook of Bar-Coding Systems
Application of 2D Barcode in Hardcopy Document Verification System
ISA '09 Proceedings of the 3rd International Conference and Workshops on Advances in Information Security and Assurance
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It is a desirable feature in a public key infrastructure (PKI) to include the signature information in a printed document for authenticity and integrity checks, in a way to bind an electronic document to the printed document. However, it is not easy to preserve the digital signature in the printed document because the digital signature is for the text code (or the whole document file), not for the text image (which can be scanned optically) in printed form. So, we propose a practical and secure method for preserving the authorized digital signatures for printed documents. We will derive a printable digital signature scheme from the Korean Certificate-based Digital Signature Algorithm (KCDSA) for secure transaction and utilize the dense two-dimensional barcode, QRcode, for printing out the signature and data in a small area within a printed document.