Improving Security of Vigenère Cipher by Double Columnar Transposition

Sinha, Nishith; Bhamidipati, Kishore

doi:10.5120/17591-8290

Cited by 14 publications

(15 citation statements)

References 2 publications

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“…Nishith and Kishore (2014) proposed improving security of Vigenè re cipher by double columnar transposition [7]. This involves applying the Vigenè re cipher on a plaintext, before subsequently applying columnar transposition twice to further scramble the text.…”

Section: Cryptanalysismentioning

confidence: 99%

“…It then uses modular arithmetic to transform the integer that each plaintext letter corresponds to into another integer that corresponds to a cipher text letter. The encryption function for a single letter is defined as equation (7). The algebraic computing for encryption process of the Vigenè re-Affine cipher is demonstrated in Fig.…”

Section: B Algebraic Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

A Complex Transformation of Monoalphabetic Cipher to Polyalphabetic Cipher: (Vigenère-Affine Cipher)

Naing¹,

Aung²

2019

IJMLC

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Fast progression of digital data exchange in electronic way, information security is becoming much more important in data storage and transmission on public communication networks. Cryptography has come up as a solution which plays a vital role in information security system against malicious attacks. In cryptography, there are various cipher techniques such as monoalphabetic cipher, polyalphabetic cipher, etc. to support data confidentiality as security mechanisms. They are methods of encrypting plain text message into cipher text protecting it from adversaries. The process of encryption of alphabets is the converting original message into non readable form. One of the most popular cipher techniques is the Vigenè re cipher. It is a polyalphabetic cipher technique which uses the Vigenè re table for the process of encryption of alphabets. As the Vigenè re cipher does not have the properties of diffusion and confusion, it is longer vulnerable to Kasiski and Friedman attacks based on letter frequency analysis. Thus, in this paper we propose a polyalphabetic cipher that is a new encryption and decryption technique with diffusion and confusion properties based on the concept of the complex cipher used by combining of Vigenè re cipher with Affine cipher for the increase of data security in data storage and transmission on public communication networks. Our proposed technique can also be considered as a complex transformation technique from Affine cipher known as a monoalphabetic cipher technique to a new polyalphabetic cipher technique that is called Vigenè re-Affine cipher.

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Section: Cryptanalysismentioning

confidence: 99%

Section: B Algebraic Descriptionmentioning

confidence: 99%

A Complex Transformation of Monoalphabetic Cipher to Polyalphabetic Cipher: (Vigenère-Affine Cipher)

Naing¹,

Aung²

2019

IJMLC

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“…Suppose the array of components R in Fig. 2 which consists of 15 columns and 15 rows, using 45820 as seeds obtained random sequences from 0 to 14 in order of [1,9,11,3,5,6,8,10,0,7,14,13,4,12,2] for the columns and [8, 6,1,13,3,11,0,2,12,10,7,5,4,9,14] for rows.…”

Section: Methodsmentioning

confidence: 99%

“…So it can be said that the ciphertext of the transposition is a permutation [3] of the plaintext. The widely used transposition techniques for text encryption include rail fence [3], route transposition [4], columnar transposition [4], double transposition [5], [6] and Myszkowsky transposition [7].…”

Section: Fig 1 the Color Components Of An Rgb Imagementioning

confidence: 99%

Encryption of RGB Image Using Hybrid Transposition

Rizal¹,

Utomo²,

Rihartanto³

et al. 2019

Proceedings of the 1st International Conference on Life, Innovation, Change and Knowledge (ICLICK 2018)

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Nowadays digital imagery is used for many purposes. Starting just as a hobby of photography up to the purpose of security or identification. For more sensitive purposes, an image needs to be encrypted so that the image is not recognized by an unauthorized person. In this study, hybrid transposition is used to encrypt and decrypt RGB images. The hybrid transposition here involves the process of randomization and repositioning of pixels before transposition is made. The performance of the encryption is measured by the correlation coefficient where the good result is indicated by the correlation coefficient value close to 0 (zero). The smallest coefficient values obtained are -0.0227 for test images in the form of chessboard pieces that have almost the same black and white areas. The decryption process produces the exact same image as the original image, this is indicated by the MAE value equal to 0 (zero) and the correlation coefficient equal to 1.0.

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“…Authors in [5] presented similar work on image the Authors in [1] have mentioned the positive consequences of using a shuffle based technique. The proposed algorithm design also considered the author in [3] mentioning the downside of using linear congruential generator as the PRNG which includes statistical determinism due to the mechanical nature of the algorithm.…”

Section: Related Workmentioning

confidence: 99%

Permutation based image encryption algorithm using block cipher approach

Rawat

Gupta

Goel

et al. 2015

2015 International Conference on Advances in Computing, Communications and Informatics (ICACCI)

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Encryption is a process of hiding significant data so as to prevent unauthorized access and ensure confidentiality of data. It is widely used to transmit data across networks ensuring secure communication. This paper aims at improving the security and efficiency of image encryption by using a highly efficient shuffle based encryption algorithm and an equivalent decryption algorithm based on random values obtained by using pseudorandom number generator. Due to the immense amount of possibilities of instances of the encrypted image which can be generated by shuffling the pixels as a block (or on a pixel by pixel basis), the algorithm proves to be highly impervious to brute force attacks. The proposed algorithm has been examined using multiple analysis methods to support its robustness for achieving good results.

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Improving Security of Vigenère Cipher by Double Columnar Transposition

Cited by 14 publications

References 2 publications

A Complex Transformation of Monoalphabetic Cipher to Polyalphabetic Cipher: (Vigenère-Affine Cipher)

A Complex Transformation of Monoalphabetic Cipher to Polyalphabetic Cipher: (Vigenère-Affine Cipher)

Encryption of RGB Image Using Hybrid Transposition

Permutation based image encryption algorithm using block cipher approach

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