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Cryptanalysis of the SoDark Cipher for HF Radio Automatic Link Establishment
Swedish Defence University, Department of Military Studies, Science of Command and Control and Military Technology Division, Military Technology Applications Section. University of Skövde, Skövde, Sweden.ORCID iD: 0000-0001-9246-0263
2021 (English)In: IACR Transactions on Symmetric Cryptology, ISSN 2519-173X, Vol. 2021, no 3, p. 36-53Article in journal (Refereed) Published
Abstract [en]

The SoDark cipher is used to protect transmitted frames in the second and third generation automatic link establishment (ALE) standards for high frequency (HF) radios. The cipher is primarily meant to prevent unauthorized linking and attacks on the availability of HF radio networks. This paper represents the first known security analysis of the cipher used by the second generation ALE protocol—the de facto world standard—and presents a related-tweak attack on the full eight round version of the algorithm. Under certain conditions, collisions of intermediate states several rounds into the cipher can be detected from the ciphertext with high probability. This enables testing against the intermediate states using only parts of the key. The best attack is a chosen-ciphertext attack which can recover the secret key in about an hour with 100% probability, using 29 chosen ciphertexts.

Place, publisher, year, edition, pages
2021. Vol. 2021, no 3, p. 36-53
Keywords [en]
automatic link establishment, ALE, SoDark, cryptanalysis, block cipher
National Category
Other Mathematics
Research subject
Systems science for defence and security
Identifiers
URN: urn:nbn:se:fhs:diva-10325DOI: 10.46586/tosc.v2021.i3.36-53ISI: 000700710300002OAI: oai:DiVA.org:fhs-10325DiVA, id: diva2:1595573
Available from: 2021-09-20 Created: 2021-09-20 Last updated: 2022-05-11Bibliographically approved

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Dansarie, Marcus

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