Krypton by krypt.co

Krypton Core is the new home for your SSH and PGP private key. Generate a new public/private keypair, pair your phone with one or more computers, and use SSH & Git as you normally would.

Every time you run an `ssh` on a paired computer, an ssh login request will be sent to your phone for your approval. If enabled, every time you do a `git commit` on a paired computer, Krypton will prompt you for your approval before the commit is PGP-signed. Krypton gives you full control over your keys; you always know when your private key is used.

No more accidentally uploading or sending the private key. Krypton helps you add your public key to GitHub, AWS, Google Cloud, DigitalOcean, Heroku, or any server that supports SSH.

Krypton combines the secure key storage of a USB smart card with a familiar mobile phone interface. The Krypton app performs SSH and PGP signatures without revealing the private key to a paired computer. A Krypton SSH key can be used without modifying any servers, allowing users to secure their GitHub, AWS, and Google Cloud SSH authentication without any changes to their infrastructure.