Abstract
DES has been serving as the official federal standard for data encryption since the 70s, until it was replaced in 2001 by the Advanced Encryption Standard (AES). This paper thoroughly examines the encryption and decryption procedure, describing in detail and illustrating each step of the process. Additionally, we showcase the practical implementation of DES using the CrypTool platform, addressing the lack of a comprehensive and user-friendly tutorial on DES within this context. The paper endeavors to address this gap, enhancing the readers’ understanding of the DES operation by delving into its internal mechanism and the transformations the plaintext undergoes to become ciphertext. In addition, we engage in a critical examination of CrypTool's implementation of DES and the platform’s utility as an educational resource, highlighting both its strengths and shortcomings. The review of CrypTool as a learning tool not only provides insights into the practical implementation of DES but also emphasizes the significance of hands-on learning in modern cryptography. Moreover, we present a historical analysis of attempts at breaking the DES cipher, from its approval as a standard until more recent developments, and assess its relevance in today's cryptographic landscape. Ultimately, this paper aspires to serve as a valuable teaching resource for cryptography students and educators, bridging the gap between theoretical knowledge and practical application.
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© 2024 ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
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Meça, A. (2024). Exploring Data Encryption Standard (DES) Through CrypTool Implementation: A Comprehensive Examination and Historical Perspective. In: Miraz, M.H., Southall, G., Ali, M., Ware, A. (eds) Emerging Technologies in Computing. iCETiC 2023. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 538. Springer, Cham. https://doi.org/10.1007/978-3-031-50215-6_10
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DOI: https://doi.org/10.1007/978-3-031-50215-6_10
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