Comparative Study between Stream Cipher and Block Cipher using RC4 and Hill Cipher

Ahmad, Shish; Beg, Mohd. Rizwan; Abbas, Qamar; Ahmad, Jameel; Atif, Syed Mohd

doi:10.5120/465-770

Cited by 5 publications

(2 citation statements)

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“…This case is referred to as self-synchronized because of the ability to re-synchronize after insertion or deletion of bits. Although self-synchronization can be an important property, this type of the stream cipher has not received much attention [4].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Security and Speed of RC4

al.¹

2015

IJCNT

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Wireless communication security is a critical factor for secure communication among large scale of wireless networks. A limited resource constraint, such as power and memory size presents a significant challenge to implement existing cryptographic algorithms. One of the most important symmetric cryptographic algorithms is Rivest Cipher 4 (RC4) stream cipherthatis utilized in many real-time security applications. However, the RC4 cipher shows some weaknesses, including a correlation problem between the public known outputs of the internal state. In this paper, we propose RC4 stream cipher with a random initial state (RRC4) to solve the weak keys problem of the RC4 using a random initialization of internal state S. We also propose RC4 stream cipher with two state tables (RC4-2S) to solve the correlation problem between the public known outputs of the internal state using permutation between state1 (S 1 ) and state 2 (S 2 ) while requiring less time than RC4. Finally, we propose RC4 stream cipher with two state tables togenerate four keys (RC4-2S + ) in each cycle which further enhances randomness overRC4-2S and RRC4.

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Section: Introductionmentioning

confidence: 99%

“…RC4 is fast in comparison to other algorithms, and it has a simple design hardware implementation [7]. In addition, RC4 is five times faster than Data Encryption Standard (DES) and fifteen times faster than Triple-DES [4].…”

Section: Introductionmentioning

confidence: 99%