This document is a presentation from the GCHQ on the capabilities, sensitivities and protocol of the cryptanalytical BULLRUN project - which "covers the ability to defeat encryption used in specific network communications," such as VPN, SSH, TLS/SSL, eVoIP, HTTPS, IPEC etc.
Government Communications Headquarters (GCHQ)
Information has been redacted
Government Communications Headquarters (GCHQ), “BULLRUN,” Snowden Archive, accessed September 28, 2022, https://grid.glendon.yorku.ca/items/show/657.
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