Journal of Zhejiang University-SCIENCE A

, Volume 7, Issue 12, pp 2022–2030 | Cite as

How to repair the Hill cipher

  • Ismail I. A. 
  • Amin Mohammed 
  • Diab Hossam 
Article

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.

Key words

Hill cipher Image encryption Modified Hill cipher Quality of encryption 

CLC number

TP393 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Ismail I. A. 
    • 1
  • Amin Mohammed 
    • 2
  • Diab Hossam 
    • 2
  1. 1.Faculty of Computers and InformationZagazig UniversityZagazigEgypt
  2. 2.Computer Science Department, Faculty of ScienceMenoufiya UniversityShebeen El-komEgypt

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