Conclusion, Acknowledgements, and References

Table of Links

Abstract and 1. Introduction

2. Description of two analyzed image encryption algorithms

3. Cryptanalysis of IEATD

4. Cryptanalysis of IEACD

5. Conclusion, Acknowledgements, and References

5. Conclusion

This paper analyzed security performance of an image encryption algorithm based on a first-order time-delay system IEATD and the enhanced version IEACD. Although another research group proposed a chosen-plaintext attack on IEATD, we presented an enhanced attack using the correlation between adjacent vectors of one plain-image and the corresponding cipher-image. Although IEACD is designed by the attacking group with intention to fix the security defects of IEATD, there still exist some security pitfalls, such as invalid secret keys, insensibility of keystream generation mechanics, and improper configuration of keystream. Based on these, we designed an efficient chosen-plaintext attack and verified it with extensive experiments. The serious insecurity of the two algorithms cannot be improved by simple modifications. They can work as typical counterexamples to remind us to recast scenario-oriented image encryption algorithms following the guidelines and lessons summarized in [9, 7, 3].

Acknowledgement

This work was supported by the National Natural Science Foundation of China (no. 61772447), Scientific Research Fund of Hunan Provincial Education Department (no. 20C1759), and Science and Technology Program of Changsha (no. kq2004021).

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