Hardware-based SSH/GPG agent

See SatoshiLabs' blog posts about this feature:

• TREZOR Firmware 1.3.4 enables SSH login
• TREZOR Firmware 1.3.6 — GPG Signing, SSH Login Updates and Advanced Transaction Features for Segwit
• TREZOR Firmware 1.4.0 — GPG decryption support

Installation

See the following instructions for the TREZOR, Keepkey and Ledger Nano S devices.

Usage

For SSH, see the following instructions (for Windows support, see trezor-ssh-agent project by Martin Lízner).

For GPG, see the following instructions.

See here for PIN entering instructions.