An electronic bill encryption algorithm based on multiple watermark encryption

Abstract

Digital image watermarking can authenticate and protect images through image processing and cryptography. The encryption of digital watermarks helps to effectively improve the performance of digital watermarking, thereby meeting the needs of bill image authentication in the actual financial system. This paper firstly proposes a method to resist JPEG compression attack. The proposed method enhances the anti-attack ability of watermarks by constructing the wavelet coefficient matrix and binary sequence for chaotic encryption, and effectively improves the security of electronic bills in transmission. Considering the special needs of financial bills, the authors presented a method to detect the key information area of bills, and encrypt multiple watermarks. Application results show that the proposed method can identify and encrypt the key area of each bill, as well as detect and curb tampering and forgery, providing a guarantee to the security of financial bills.