Abstract
Recently two encryption schemes were proposed by combining circular bit shift and XOR operations, under the control of a pseudorandom bit sequence (PRBS) generated from a chaotic system. This Letter studies the security of these two encryption schemes and reports the following findings: (1) there exist some security defects in both schemes; (2) the underlying chaotic PRBS can be reconstructed as an equivalent key by using only two chosen plaintexts; (3) most elements in the underlying chaotic PRBS can be obtained by a differential known-plaintext attack using only two known plaintexts. Experimental results are given to demonstrate the feasibility of the proposed attack.
Original language | English |
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Pages (from-to) | 23-30 |
Number of pages | 8 |
Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |
Volume | 369 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 10 Sept 2007 |
Keywords
- Chaos
- Chosen-plaintext attack
- Cryptanalysis
- Delayed chaotic neural network
- Differential cryptanalysis
- Encryption
- Known-plaintext attack
ASJC Scopus subject areas
- General Physics and Astronomy