DeCrypt: a 3DES inspired optimised cryptographic algorithm

Chowdhury, Deepraj; Dey, Aritra; Garai, Ritam; Adhikary, Subhrangshu; Dwivedi, Ashutosh Dhar; Ghosh, Uttam; Alnumay, Waleed S.

doi:10.1007/s12652-022-04379-7

Cited by 7 publications

(9 citation statements)

References 22 publications

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“…Consider the remaining tapping bits of REG3, i.e., REG3 [20] and REG3 [7]. At the time of initialization, for each bit position, we make two replicas and each one is initialized by both possibilities (0 and 1).…”

Section: Proposed Attackmentioning

confidence: 99%

“…For instance, REG3 is clocked just after initialization of REG1. As a result, bits of register REG3 are shifted downwards, i.e., REG3 [22], REG3 [21], REG3 [11], and REG3 [8] are assigned known value of REG3 [21], REG3 [20], REG3 [10], and REG3 [7], respectively, and the XORing result of feedback polynomial is set to REG3[0]. In this way, REG3[0], REG3 [8], and REG3 [11] become known and REG3 [7], REG3 [10], and REG3 [20] become unknown and the remaining positions of REG3 remain unknown since downwards shifting is done by an unknown value.…”

Section: Proposed Attackmentioning

confidence: 99%

“…Here, the counter associated with REG3 is increased by 1. Afterward, REG3 [7], REG3 [10], and REG3 [20] are guessed again for executing further rounds of attack, but after three rounds of clocking, we need not to guess REG3 [10] because the number of bits after the 7th index is three (i.e., 8th, 9th, and 10th). A complete iteration-based determination algorithm for determining contents of REG2 and REG3 is shown in Algorithm 1.…”

Section: Proposed Attackmentioning

confidence: 99%

“…After initialization, we have state candidates with all bits of REG1 (guessed register), three bits of REG2 (i.e., REG2 [10], REG2 [20], and REG2 [21]), and fve bits of REG3 (i.e., REG3 [7], REG3 [10], REG3 [20], REG3 [21], and REG3 [22]). Out of these eight bits, three bits: MSB of REG2, MSB of REG3, and second MSB of REG3, remain known in further rounds of attack.…”

Section: Attack Analysismentioning

confidence: 99%

“…Historically, stream ciphers were designed to be employed in real-time systems because of their high-speed encryption capability. However, modern block ciphers are also capable of encrypting at high data rates, e.g., AES, PRESENT [6], and 3DES [7]. Nevertheless, some important applications where the computational resources are limited still prefer stream ciphers to encrypt large quantities of fast streaming data [8].…”

Section: Introductionmentioning

confidence: 99%

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A New Guess-and-Determine Method for Cryptanalysis of the GSM Encryption

et al. 2023

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Cryptanalysis is the process of finding flaws or oversights in an encryption algorithm. Nearly, all encryption algorithms are carefully examined through cryptanalysis to determine the security of the system in which the encryption algorithm has been employed. A5/1 is a well-known encryption algorithm which is inbuilt in mobile phone for securing GSM communication, and therefore, cryptanalysis of this algorithm is also important. A5/1 consists of three linear feedback registers of lengths 23, 22, and 19 bits. Due to the nonlinear clocking mechanism of A5/1, cryptanalytic attacks of guess-and-determine (GD) nature are efficient and more successful. In this paper, we propose a new low keystream GD attack on GSM encryption algorithm A5/1. The basic idea of GD attack is guessing some portion of the registers of A5/1 and determining remaining portion of the registers via the relationship between the register’s state and the known intercepted keystream. The guessed and determined register’s state is validated by running the cipher forward from that state. If the intercepted keystream matches the generated keystream, we accept it. Otherwise, we discard and try the attack again. The computational complexity and the success rate of the proposed attack are O 2 52 and 96.6%, respectively.

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Section: Proposed Attackmentioning

confidence: 99%

Section: Proposed Attackmentioning

confidence: 99%

Section: Proposed Attackmentioning

confidence: 99%

Section: Attack Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Guess-and-Determine Method for Cryptanalysis of the GSM Encryption

et al. 2023

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An effective cryptanalysis of DES for secure communication using hybrid cryptanalysis and deep neural network

F¹,

Karuppasamy²

2023

Concurrency and Computation

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SummaryIn today's world, information security plays a key role in data storage and communication owing to the modern evolution of digitized data interchange in electronic mode. Cryptography is a widely preferred technique for securing transmitted information by transforming the original text into cipher text. A few cryptographic techniques have the inability to protect the data which are vulnerable to a distinct class of attacks. Therefore, a reliable cryptographic technique is necessitated for enlarging information security. In this paper, a new hybrid cryptanalysis (HCA) model has been proposed to acquire optimal cryptanalysis of data encryption standard (DES). It combines linear cryptanalysis (LCA) and neural cryptanalysis (NCA) for enhancing the performance of the cryptographic system with minimal time complexity. Primarily, the HCA model employs LCA to break cryptographic codes by analyzing linear approximations of the cryptographic algorithm. NCA is then applied with the aid of a deep neural network for identifying patterns in larger datasets. These patterns can be further utilized to break encryption. The efficacy of the proposed HCA model will be assessed through the assessment of three different datasets. The results manifest that the accuracy of the proposed model is increased up to 97.66% and the time needed to break encryption can be reduced.

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Guest Editorial: Advanced information hiding techniques for industrial applications

Singh

2023

J Ambient Intell Human Comput

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DeCrypt: a 3DES inspired optimised cryptographic algorithm

Cited by 7 publications

References 22 publications

A New Guess-and-Determine Method for Cryptanalysis of the GSM Encryption

A New Guess-and-Determine Method for Cryptanalysis of the GSM Encryption

An effective cryptanalysis of DES for secure communication using hybrid cryptanalysis and deep neural network

Guest Editorial: Advanced information hiding techniques for industrial applications

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