About Atsign

We’re creating the next generation of Internet technology with simplicity, security, and privacy—built in.

Atsign is a team of diverse, distributed, and dedicated people who are passionate about privacy and security. We created the patented, open-spec Atsign Protocol™, and built the open-source Atsign Platform™ to enable people, entities, and things to communicate privately and securely over the Internet.

Our award-winning technology is a complete rethink of cybersecurity, one powerful enough to protect critical infrastructure systems and scalable enough to extend that protection to everyone and everything connected to the Internet.

Aparna Rayasam

CEO

Aparna Rayasam is the Chief Executive Officer of Atsign, where she leads the company’s mission to deliver foundational security and governance for the emerging era of agentic AI. With over 28 years of leadership experience at top-tier technology companies, including Akamai, Palo Alto Networks, and F5, Aparna is a recognized specialist in product-led transformation and enterprise revenue scaling. She has a proven history of growing early-stage security portfolios into multi-billion-dollar market leaders, with deep expertise in product strategy, platform architecture, and threat research.

Colin Constable

Co-founder, CTO

Colin Constable is the CTO and co-founder of Atsign, a company building the next generation of Internet technology with simplicity, security, and privacy built in. He is a technologist with 40 years of experience in the telecommunications and internet industries. Colin’s credits include his career at British Telecom, CTO at Credit Suisse Bank, then heading to Silicon Valley for strategy work at Juniper Networks and co-founding Deutsche Bank Labs. Colin is passionate about privacy and security, and he believes that Atsign can help to create a more open and decentralized internet.