We present a Single-key Length Doubler built on an n-bit Tweakable block cipher (SLDT), which is a length-preserving cipher on the strings with bit length in integer interval [n, n+1, …, 2n−1]. SLDT is mainly motivated to reduce the key material size of a length doubler proposed by Chen et al. at FSE2018, since the key management is always challenging in practice. We prove that SLDT is a strong pseudo-random permutation (SPRP) if the underlying tweakable block cipher is SPRP.
CITATION STYLE
Zhang, X., Shen, Y., Yan, H., Zou, Y., Wan, M., Wu, Z., & Wang, L. (2018). Length-preserving encryption based on single-key tweakable block cipher. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 11192 LNCS, pp. 313–326). Springer Verlag. https://doi.org/10.1007/978-3-030-01446-9_18
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