A systematic study on classical cryptographic cypher in order to design a smallest cipher

Biswas, Md. Shamim Hossain; Ali, Md. Asraf; Rahman, Mostafijur; Sohel, Md. Khaled; Hasan, Md. Maruf; Sarkar, Kausik; razzaque, Abu Shamim Aminur

doi:10.29322/ijsrp.9.12.2019.p9662

Cited by 2 publications

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“…Data is secured based on the cryptographic and cipher algorithm [1] used according to the type of data being hidden. Cipher [2] technology can be based on mathematical theories and some are based on classical calculations [3]. In this paper, the classical cipher called Affine cipher [2], [4]- [6] is modified to minimize the production of repetitive characters in the ciphertext.…”

Section: Introductionmentioning

confidence: 99%

“…Cipher [2] technology can be based on mathematical theories and some are based on classical calculations [3]. In this paper, the classical cipher called Affine cipher [2], [4]- [6] is modified to minimize the production of repetitive characters in the ciphertext. This is realized by introducing a random seed that produces unique encryption keys called keystream for the affine encryption and decryption function.…”

Section: Introductionmentioning

confidence: 99%

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A Keystream-Based Affine Cipher for Dynamic Encryption

T¹

2020

IJETER

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In this paper, the use of a random seed is integrated to Affine cipher. The random seed is used to generate unique keystream values that dynamically changes the cipher's additive key for every character encrypted. The modification enables the cipher algorithm to produce ciphertext with no trace of repetitive character despite the advent of repetition of characters in the plaintext. Simulation results revealed that the proposed method produces more randomize ciphertext characters as against the traditional Affine cipher. The new method enhances the cipher's capability and complexity in masking plaintext which has paved the way to a more secure and dynamic data encryption.

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