Abstract
A simple method is proposed to achieve high quality multiple-image encryption through the use of random binary plaintext and QR code. In the encryption phase, multiple images are converted into QR codes, and then each QR code is subjected to exclusive-OR operation with random binary plaintext to obtain the corresponding decryption key. The random binary plaintext is further treated as the input of a single image cryptosystem for encryption resulting in improved encryption strength. In the decryption phase, the random binary plaintext is decrypted with multiple decryption keys to recover QR codes. The high quality original images are retrieved by scanning the recovered QR codes with a QR code scanning system.
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