Cryptanalysis on classical cipher based on Indonesian language

Marwati, Rini; Yulianti, Kartika

doi:10.1088/1742-6596/1013/1/012147

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…This paper also uses cryptanalysis to find how to secure this method. Cryptanalysis is a process to break a cipher in illegal decryption [9]. The cryptanalysis process uses Cryptool 2.1.…”

Section: Resultsmentioning

confidence: 99%

Modified Vegenere Cipher to Enhance Data Security Using Monoalphabetic Cipher

Rahmawati

Kurniawan

2019

Int.J.Artif.Intell.Robot.

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The rapid progression of exchange data by public networks is important, especially in information security. We need to keep our information safe from attackers or intruders. Furthermore, information security becomes needed for us. Many kind cipher methods of cryptography are improved to secure information such as monoalphabetic cipher and polyalphabetic cipher. Cryptography makes readable messages becoming non-readable messages. One of the popular algorithms of a polyalphabetic cipher is Vigenere cipher. Vigenere cipher has been used for a long time, but this algorithm has weaknesses. The calculation of the encryption process is only involving additive cipher, it makes this algorithm vulnerability to attacker based on frequency analysis of the letter. The proposed method of this research is making Vigenere cipher more complex by combining monoalphabetic cipher and Vigenere cipher. One of the monoalphabetic ciphers is Affine cipher. Affine cipher has two steps in the encryption process that are an additive cipher and a multiplicative cipher. Our proposed method has been simulated with Matlab. We also tested the vulnerability of the result of encryption by Vigenere Analyzer and Analysis Monoalphabetic Substitution. It shows that our method overcomes the weakness of Vigenere Cipher. Vigenere cipher and Affine cipher are classical cryptography that has a simple algorithm of cryptography. By combining Vigenere cipher and Affine cipher will make a new method that more complex algorithm.

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“…This paper also uses cryptanalysis to find how to secure this method. Cryptanalysis is a process to break a cipher in illegal decryption [9]. The cryptanalysis process uses Cryptool 2.1.…”

Section: Resultsmentioning

confidence: 99%

Modified Vegenere Cipher to Enhance Data Security Using Monoalphabetic Cipher

Rahmawati

Kurniawan

2019

Int.J.Artif.Intell.Robot.

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“…But the primary weakness of the Vigenere cipher is the repeating nature of its key. If a cryptanalyst correctly guesses the key's length, then the ciphertext can be treated as can be easily broken [18]. To compute the relative frequency of the message, the equation below is used.…”

Section: Relative Frequency Analysismentioning

confidence: 99%

Performance Analysis of the Modified Vigenere Algorithm to Secure Data

2019

Proceedings of 2019 the 9th International Workshop on Computer Science and Engineering

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The Vigenere algorithm is simple but considered unbreakable. However, the repeating key is its weakness and is still widely developed by researchers to increase the key length of the algorithm. This study aims to test and evaluate the security performance of the modified Vigenere cipher algorithm to address its vulnerability. The results show that the modified algorithm effectively overcomes Kasiski attack. Moreover, the frequency analysis test shows that the frequency of occurrence of alphabetic letters I and O obtained 9.0 curve value whereas M and V have 6.7 curve value. This frequency analysis result indicates that the enhanced Vigenere algorithm has reduced the effect of cryptanalysis. The modified algorithm has also passed the randomness ciphertext test when the frequency (monobit) test was performed. The result shows that the p-value computed is 0.841 which is higher than 0.01; hence, the generated ciphertext is considered random.

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Cryptanalysis on classical cipher based on Indonesian language

Cited by 2 publications

References 2 publications

Modified Vegenere Cipher to Enhance Data Security Using Monoalphabetic Cipher

Modified Vegenere Cipher to Enhance Data Security Using Monoalphabetic Cipher

Performance Analysis of the Modified Vigenere Algorithm to Secure Data

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