Bit encryption coding and decoding method of digital image

• Main Authors: QIAN JIN, WANG JUN, BAO HAIYU, SUN WENQING, WU QUANYING, XU XINGNAN
• Format: Patent
• Language: Chinese; English
• Published: 08.11.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

The invention discloses a bit-level encryption coding and decoding method for a digital image, and belongs to the field of image coding and decoding. According to the technical scheme, a gray value of a digital image is decomposed into a single-bit matrix group, pixel-by-pixel and bit-by-bit encryption is carried out according to a randomly generated key matrix, the encrypted bit matrix group is recombined into a ciphertext image, and the ciphertext image is transmitted to a receiver through a public channel. And the corresponding secret key matrix and the encryption mark matrix are transmitted through a secret channel. The method has the advantages that the length of the secret key is short, occupation of secret channel resources is reduced, the speed of the encryption process is high, and the encryption result can resist a universal password attack technology. 本发明公开一种数字图像的比特级加密编码与解码方法，属于图像编码与解码领域。本发明的技术方案是将数字图像的灰度值分解为单比特矩阵组，然后根据随机生成的密钥矩阵进行逐像素、逐比特的加密，再将加密完成的比特矩阵组重新组合成密文图像，通过公共信道传输给接收者。而相应的密钥矩阵和加密标志矩阵则通过保密信道进