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CLC number: TP393
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Received: 2006-03-20
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How to repair the Hill cipher
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ISMAIL I.A., AMIN Mohammed, DIAB Hossam. How to repair the Hill cipher[J]. Journal of Zhejiang University Science A, 2006, 7(12): 2022-2030.
@article{title="How to repair the Hill cipher",
author="ISMAIL I.A., AMIN Mohammed, DIAB Hossam",
journal="Journal of Zhejiang University Science A",
volume="7",
number="12",
pages="2022-2030",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.A2022"
}
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Abstract: The hill cipher algorithm is one of the symmetric key algorithms that have several advantages in data encryption. However, a main drawback of this algorithm is that it encrypts identical plaintext blocks to identical ciphertext blocks and cannot encrypt images that contain large areas of a single color. Thus, it does not hide all features of the image which reveals patterns in the plaintext. Moreover, it can be easily broken with a known plaintext attack revealing weak security. This paper presents a variant of the hill cipher that overcomes these disadvantages. The proposed technique adjusts the encryption key to form a different key for each block encryption. Visually and computationally, experimental results demonstrate that the proposed variant yields higher security and significantly superior encryption quality compared to the original one.
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