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- W2892492927 abstract "Length doublers are cryptographic functions that transform an n-bit cryptographic primitive into an efficient and secure cipher that length-preservingly encrypts strings of length in $$[n,2n-1]$$ . All currently known constructions are only proven secure up to the birthday bound, and for all but one construction this bound is known to be tight. We consider the remaining candidate, $$mathrm {LDT}$$ by Chen et al. (ToSC 2017(3)), and prove that it achieves beyond the birthday bound security for the domain [n, 3n / 2). We generalize the construction to multiple rounds and demonstrate that by adding one more encryption layer to $$mathrm {LDT} $$ , beyond the birthday bound security can be achieved for all strings of length in $$[n,2n-1]$$ : security up to around $$2^{2n/3}$$ for the encryption of strings close to n and security up to around $$2^{n}$$ for strings of length close to 2n. The security analysis of both schemes is performed in a modular manner through the introduction and analysis of a new concept called “harmonic permutation primitives.”" @default.
- W2892492927 created "2018-10-05" @default.
- W2892492927 creator A5032130714 @default.
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- W2892492927 creator A5058556310 @default.
- W2892492927 date "2018-01-01" @default.
- W2892492927 modified "2023-09-30" @default.
- W2892492927 title "Short Variable Length Domain Extenders with Beyond Birthday Bound Security" @default.
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- W2892492927 doi "https://doi.org/10.1007/978-3-030-03326-2_9" @default.
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