Secret Double Octopus (SDO) is a cybersecurity software company specializing in passwordless authentication for enterprise environments.

[2][3] The company's core product is based on proprietary password alternatives for password-based legacy systems and secure communications using secret sharing algorithms, originally developed to protect nuclear launch codes,[4] now used to prevent cyber attacks.

Secret Double Octopus' technology is regarded as a universal replacement for passwords, OTPs, physical security keys, smart cards, and other authentication mechanisms.

The company raised a $6 million A round from JVP, Iris Capital, Liberty Israel and Benhamou Global Ventures.

[6] In April 2020, the company announced a $15 million Series B round to expand their passwordless authentication and remote-access security solutions for enterprises.