Our final project for Theory of Crytography class.
Our Image Encryption/Decryption method based on:
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Rubik Cube principle (paper here)
My implementation can be introduced by four main parts:
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Three channels of the image are splited before encrypting with Rubik cube algorithm. The key of the encryption is encrypted by AES.
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After that, these encrypted channels are combined to generate the Encrypted Image.
The flow of decryption is the inverse transformation which is described below:
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Split the encrypted image to 3 encrypted channels
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Get the original key from the AES decrypt function
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Decrypt 3 channels with the decrypted key
I propose two measures to quantify the differ between the encrypted image and its original form:
- Number of pixels change rate (NPCR)
- The unified average changing intensity (UACI)