GI Digital Library :: Auflistung nach Schlagwort "Global Optimization"

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Zeitschriftenartikel
Optimizing Parallel Runtime of Cryptanalytic Algorithms by Selecting Between Word-Parallel and Bit-Serial Variants of Program Parts
(PARS-Mitteilungen: Vol. 33, Nr. 1, 2016) Eitschberger, Patrick; Keller, Jörg
Cryptanalytic algorithms such as dictionary attacks, that test huge numbers of keys to decrypt a ciphertext to a certain plaintext, need lots of computational resources and efficient coding, but allow large scale parallelism such as many-cores plus GPUs. Some attacks have profited from a bit-serial data representation, that allows SIMD-like coding per thread and increases the degree of parallelism. We investigate the question how to decide for distinct parts of such algorithms whether to code them in a bit-serial or normal word-parallel manner. Given bit-serial and word-parallel variants for each part of the cryptographic algorithm, we benchmark the runtime of the variants, and additionally the runtime of the conversion between the different data rep- resentations. Then we model the resulting variant selection problem as a direct graph — in the fashion of a global composition optimization problem — and find the optimal runtime by computing the shortest path from source to sink node. We evaluate our approach with the Advanced Encryption Standard (AES) and demonstrate runtime advantages.