Similar to Signal_(メッセージングアプリ)

OpenSSL

Openswan

OpenVPN

Ophcrack

Peer-to-peer

Pretty Good Privacy

ProVerif

PuTTY

Qubes OS

S/KEY

S/MIME

Secure Shell

Security Support Provider Interface

Silent Circle (software)

SSLeay

StrongSwan

Syskey

Tails (operating system)

Guardian Project (software)

Comparison of TLS implementations

Whonix

WinSCP

WireGuard

WolfSSL

Wuala

ZeroNet