Sichere Inter-Netzwerk Architektur

Sichere Inter-Netzwerk Architektur (SINA) is a cryptographic system developed by and a product of the Bundesamt für Sicherheit in der Informationstechnik, an arm of the German government. It also has the anglicized name Secure Inter-Network Architecture. As of April 2024 the cryptosystem was employed by "many European governments for transmitting classified information".

History
SINA came to prominence in March 2023 when it was divulged in a court warrant for the arrest of the Austrian intelligence officer Egisto Ott, who has a relationship with Wirecard fraudster Jan Marsalek, that a SINA laptop was handed to the Russian secret services,       specifically the Lubyanka Building office of the FSB.

The Austrian authorities report that Ott received €20,000 for the laptop from Marsalek.