Paper 2026/1309
Forensic Cryptanalysis of the Backdoored UA-8295 Message Terminal
, Centrum Wiskunde & InformaticaAbstract
Nation State Agencies go to great lengths to obtain signal intelligence, including backdooring cryptographic standards and equipment. Although the existence of these backdoor efforts is common knowledge, only few of known backdoored systems have been publicly analysed. In this paper we present the first detailed $\textit{forensic cryptanalysis}$ of the backdoored UA-8295 message terminal and we try to answer questions how the UA-8295's backdoor was designed and for which attack. Towards a better understanding of real-world backdoor design, we posit a $\textit{Backdoor Conjecture}$ that provides handles to reason about the design of backdoors and the attacks they are designed for.
Metadata
- Available format(s)
-
PDF
- Category
- Attacks and cryptanalysis
- Publication info
- Preprint.
- Keywords
- Backdoored CryptographySymmetric CryptographyForensic Cryptanalysis
- Contact author(s)
-
maatje @ cwi nl
stevens @ cwi nl - History
- 2026-06-24: approved
- 2026-06-23: received
- See all versions
- Short URL
- https://ia.cr/2026/1309
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2026/1309,
author = {Stijn Maatje and Marc Stevens},
title = {Forensic Cryptanalysis of the Backdoored {UA}-8295 Message Terminal},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/1309},
year = {2026},
url = {https://eprint.iacr.org/2026/1309}
}
