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Encryption is a technique used to enhance the security of a file by rendering its contents incomprehensible. The habitual transmission of digital images requires that they are made impervious to unauthorized access. It is, however, tedious to encrypt or decrypt images directly. The Arnold transform, better known as the Arnold cat map, is the most commonly used chaos-based image encryption technique that works by shuffling image pixels. A modified form of the general Arnold cat map is proposed in this article. Arnold cat map uses only shearing, whereas the proposed method utilizes both interweaving and shearing. Like Arnold transform, the proposed method also reconstructs the original image after a certain number of cycles (iterations). The proposed method takes more than twice the number of cycles as Arnold’s to bring back the original image.

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