Krypt.co, a mobile authentication startup, has secured $1.2 million in seed funding. Rough Draft Ventures and General Catalyst led the round with participation from Slow Ventures, SV Angel and Akamai Labs.

Kryptonite combines the secure key storage of a USB smart card with a familiar mobile phone interface. The Kryptonite app performs SSH signatures without revealing the private key to a paired computer. A Kryptonite 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. Communication with Kryptonite occurs over encrypted and signed push notifications and Bluetooth, ensuring high availability and low latency.