Forensic Cryptanalysis of the Backdoored UA-8295 Message Terminal (opens in new tab)

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 bet...