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Cryptanalysis of the SoDark Cipher for HF Radio Automatic Link Establishment
Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Avdelningen för ledningsvetenskap och militärteknik (ALM), Sektionen för militärtekniska tillämpningar (MteT). University of Skövde, Skövde, Sweden.ORCID-id: 0000-0001-9246-0263
2021 (engelsk)Inngår i: IACR Transactions on Symmetric Cryptology, ISSN 2519-173X, Vol. 2021, nr 3, s. 36-53Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2021. Vol. 2021, nr 3, s. 36-53
Emneord [en]
automatic link establishment, ALE, SoDark, cryptanalysis, block cipher
HSV kategori
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URN: urn:nbn:se:fhs:diva-10325DOI: 10.46586/tosc.v2021.i3.36-53ISI: 000700710300002OAI: oai:DiVA.org:fhs-10325DiVA, id: diva2:1595573
Tilgjengelig fra: 2021-09-20 Laget: 2021-09-20 Sist oppdatert: 2022-05-11bibliografisk kontrollert

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