Randomness Analysis on Blowfish Block Cipher Using ECB and CBC Modes

Alabaichi, Ashwak; Mahmood, Ramlan; Ahmad, Faudziah; Mechee, Mohammed S.

doi:10.3923/jas.2013.768.789

Cited by 6 publications

(4 citation statements)

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“…In the same year, Alabaichi et al attempted to strengthen the security of the 64-bit Blowfish algorithm by raising both block size and key length in the same year. By extending the key size to 112 bytes rather than 56 bytes, the 128-bit Blowfish algorithm improved the security of the standard algorithm by increasing the complexity of brute force attacks and expanding the block size to 128 bits [16]. Also, Alabaichi et al attempted to analyze the security of the Blowfish algorithm proposed in [15].…”

Section: Related Workmentioning

confidence: 99%

Fast 128-bit Multi-Pass Stream Ciphering Method

Abdul-Jabbar

Abed

Mohammed

et al. 2023

Iraqi Journal of Science

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Information is an essential and valuable object in all systems. The more information you have about your issue, the better you can conform to the world around you. Moreover, information recognizes companies and provides influence that helps one company be more effective than another. So, protecting this information using better security controls and providing a high level of access to authorized parties becomes an urgent need. As a result, many algorithms and encryption techniques have been developed to provide a high level of protection for system information. Therefore, this paper presents an enhancement to the Blowfish algorithm as one of the cryptography techniques. Then it proposes an enhancement for increasing efficiency and secrecy for this algorithm, which are the main criteria for these modifications. In this paper, the main modification made for the Blowfish algorithm is altering the S-box according to the principles of the block cipher (OFB). The results were approved using hamming distance and avalanche effect. The proposed algorithm presents advantages on several points, including reducing the required time for the encryption and decryption processes and preventing transmission errors from perpetuating all data. Also, we can conclude that the modified Blowfish algorithm can be used for all text encryption systems because of its flexibility (unlimited input text size and expanding key size).

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Section: Related Workmentioning

confidence: 99%

Fast 128-bit Multi-Pass Stream Ciphering Method

Abdul-Jabbar

Abed

Mohammed

et al. 2023

Iraqi Journal of Science

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“…Therefore, the proposed algorithm has good randomness and better than from the orginal algorithm. The symbol √ in the below tables indicates a passing result while the symbol x in Table 2 indicated a failing result [11,15,[21][22][23].…”

Section: Nist Testmentioning

confidence: 99%

Enhancing advance encryption standard security based on dual dynamic XOR table and MixColumns transformation

Salih

Alabaichi

Tuama

2020

IJEECS

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An efficient approach to secure information is critically needed at present. Cryptography remains the best approach to achieve security. On this basis, the National Institute of Standards and Technology (NIST) selected Rijndael, which is a symmetric block cipher, as the advanced encryption standard (AES). The MixColumns transformation of this cipher is the most important function within the linear unit and the major source of diffusion. Dynamic MixColumns transformation can be used to enhance the AES security. In this study, a method to enhance the AES security is developed on the basis of two methods. The first method is an extension of a previous study entitled “A novel Approach for Enhancing Security of Advance Encryption Standard using Private XOR Table and 3D chaotic regarding to Software quality Factor.” In the current study, the fixed XOR operation in AES rounds is replaced with a dual dynamic XOR table by using a 3D chaotic map. The dual dynamic XOR table is based on 4 bits; one is used for even rounds, and the other is used for odd rounds. The second method is dynamic MixColumns transformation, where the maximum distance separable (MDS) matrix of the MixColumns transformation, which is fixed and public in every round, is changed with a dynamic MDS matrix, which is private, by using a 3D chaotic map. A 3D chaotic map is used to generate secret keys. These replacements enhance the AES security, particularly the resistance against attacks. Diehard and NIST tests, entropy, correlation coefficient, and histogram are used for security analysis of the proposed method. C++ is used to implement the proposed and original algorithms. MATLAB and LINX are used for the security analysis. Results show that the proposed method is better than the original AES.

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“…Optimization on the reduction of Sboxes from four to two was also applied to increase the speed [32]. Several researchers have attempted to extend the block size of blowfish to 128-bit [18], [33] [34], but results indicate an increase in time complexity and need for higher memory.…”

Section: Introductionmentioning

confidence: 99%

Modified Blowfish Algorithm

Quilala

Sison

Medina

2018

IJEECS

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Cryptography guarantees security in communication through encryption. This paper proposed a modified Blowfish encryption that uses 128-bit block size and 128-bit key to comply with minimum requirements as an encryption standard. The modification retained the original structure for easy migration but utilized two S-boxes to save memory. A derivation was added to prevent symmetry. The algorithm’s performance was evaluated using time, and avalanche. Upon testing, the modified blowfish is slower with key, encryption, and decryption average of 26.99ms, 1651.83ms, and 2765.04ms compared to blowfish with 21.65ms, 1297.76ms and 2176.59ms due to block size difference. Applying 128-bit block size increases security by decreasing the chances of having duplicate blocks that may leak information. The modified Blowfish is faster compared to Twofish with an encryption and decryption average time of 2418.08ms and 4002.70ms. The added derivation improved the avalanche of the modified blowfish. Blowfish achieved 47.14% while modified Blowfish attained 52.86%.

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Randomness Analysis on Blowfish Block Cipher Using ECB and CBC Modes

Cited by 6 publications

References 0 publications

Fast 128-bit Multi-Pass Stream Ciphering Method

Fast 128-bit Multi-Pass Stream Ciphering Method

Enhancing advance encryption standard security based on dual dynamic XOR table and MixColumns transformation

Modified Blowfish Algorithm

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