[Resource Topic] 2020/715: On (impracticality of) transfinite symmetric encryption with keys smaller than messages under GCH

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Title:
On (impracticality of) transfinite symmetric encryption with keys smaller than messages under GCH

Authors: Sergij V. Goncharov

Abstract:

In this short trivial note we argue that, assuming Generalized Continuum Hypothesis to be true, it is impractical to use encryption with Key \in \{ 0, 1 \}^K and Message \in \{ 0, 1 \}^M such that \aleph_0 \leqslant \mathrm{card}\,K < \mathrm{card}\,M, because “complexity” of the known-plaintext bruteforce attack equals “complexity” of a single En/Decrypt(Key, Message) “computation” then.

ePrint: https://eprint.iacr.org/2020/715

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