SPID
SPID (Statistical Protocol IDentification) is a statistical classification engine, used to identify encrypted or obfuscated streams from advanced Peer-to-peer or VPN protocols (ex: BitTorrent RC4 streams).
Available to all SRX running 12.3X48+
Available to all MX running 20.2R1+
Available to all vSRX running 20.3R1+