A Hybrid Computational Intelligence based Technique for Automatic Cryptanalysis of Playfair Ciphers

Din, Maiya; Pal, Saibal K.; Muttoo, Sunil Kumar; Madan, Siddharth

doi:10.14429/dsj.70.15749

Cited by 9 publications

(6 citation statements)

References 10 publications

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“…While in the proposed method, the created matrix has size 6*6 and block size is 3. The applied rules on standard Playfair algorithm are different from applied rules on the proposed modified Playfair cipher algorithm [16] [17].…”

Section: Standard Playfairmentioning

confidence: 99%

Arabic and English Texts Encryption Using Modified Playfair Algorithm

Qurban

2024

wjps

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To maintain the security and integrity of data, with the growth of the Internet and the increasing prevalence of transmission channels, it is necessary to strengthen security and develop several algorithms. The substitution scheme is the Playfair cipher. The traditional Playfair scheme uses a small 5*5 matrix containing only uppercase letters, making it vulnerable to hackers and cryptanalysis. In this study, a new encryption and decryption approach is proposed to enhance the resistance of the Playfair cipher. For this purpose, the development of symmetric cryptography based on shared secrets is desired. The proposed Playfair method uses a 5*5 keyword matrix for English and a 6*6 keyword matrix for Arabic to encrypt the alphabets of both languages.

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Section: Standard Playfairmentioning

confidence: 99%

Arabic and English Texts Encryption Using Modified Playfair Algorithm

Qurban

2024

wjps

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“…In this work, the advancement of modern technologies and methods of data analysis, the cryptanalysis operation can be programmed. Computational swarm algorithms and evolutionary algorithms may be some techniques of programming process [15]. The designed system contains many components as shown in Figure 1, the figure illustrates the use of the techniques, PSO and MPSO to attack stream cipher using ciphertext only for different lengths of LFSRi.…”

Section: Employing Pso and Mpso In Attacking Stream Ciphersmentioning

confidence: 99%

Proposed Hybrid Technique in Cryptanalysis of Cryptosystem Based on PSO and SA

Jawad

2022

Iraqi Journal of Science

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Modern ciphers are one of the more difficult to break cipher systems because these ciphers high security, high speed, non - propagation error and difficulty in breaking it. One of the most important weaknesses of stream cipher is a matching or correlation between the output key-stream and the output of shift registers. This work considers new investigation methods for cryptanalysis stream cipher using ciphertext only attack depending on Particle Swarm Optimization (PSO) for the automatic extraction for the key. It also introduces a cryptanalysis system based on PSO with suggestion for enhancement of the performance of PSO, by using Simulated Annealing (SA). Additionally, it presents a comparison for the cryptanalysis system results that were obtained by the proposed technique, which is called Modified PSO (MPSO) with classical PSO and GA. These algorithms can be used for reducing the number of attempts or trials of key space, which are needed to reach to the optimal solution (the exact initial setting of Linear Feedback Shift Register (LFSR)),and increase the speed of the search process to find the best solution. Based on the obtained results, these algorithms were shown to be effective at finding the optimal solution and the MPSO method operates better compared with PSO in the term of time and accuracy. Well known stream cipher systems were attacked by the two soft computing methods as the cases of study, which are Geffe , Brȕer and Shrinking stream cipher systems.

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“…The key to cryptography is the 25 letters of the alphabet arranged in a 5 x 5 table by removing the letter J from the alphabet. The letter J is considered the same as the letter I, because in English, the letter J has the smallest frequency of occurrence [10], [11]. Each elementabel contains letters that are different from each other.…”

Section: Playfair Chiper Algorithmmentioning

confidence: 99%

Analysis and Implementation of PlayFair Chipper Algorithm in Text Data Encoding Process

Pristiwanto

Sunandar

Nadeak³

2020

Info Sains

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This research discusses the implementation of Playfair Cipher to encode text data. Playfair Cipher is one of the classic cryptographic algorithms that use symmetry keys. Originally invented by Sir Charles Wheatstone and Baron Lyon Playfair, the algorithm used a 5x5 keyboard to encrypt and decrypt. The process of encryption and decryption is done by grouping the letters in a bigram. By using a 5x5 keyboard, we can encrypt plaintext (original text data to be encrypted) and decrypt the ciphertext (encrypted text data) by grouping it by removing the letter J from plaintext. The keypad is generated randomly by the software so that each encoding process (encryption and decryption) can use different keys. The software is also used to prove the correctness of the encryption and decryption results of the Playfair Cipher with cube keyboards. Cipher Playfair software is developed using the C++ language and is console-based in a Windows development environment.

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A Hybrid Computational Intelligence based Technique for Automatic Cryptanalysis of Playfair Ciphers

Cited by 9 publications

References 10 publications

Arabic and English Texts Encryption Using Modified Playfair Algorithm

Arabic and English Texts Encryption Using Modified Playfair Algorithm

Proposed Hybrid Technique in Cryptanalysis of Cryptosystem Based on PSO and SA

Analysis and Implementation of PlayFair Chipper Algorithm in Text Data Encoding Process

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