Atsign

Atsign is a technology company that provides an identity and secure networking platform designed to connect applications, devices, systems, and AI agents across networks without requiring open inbound ports or significant infrastructure changes. The core platform is built on a cryptographic identity model where each entity (application, device, agent, or user) is assigned a verifiable identity. All connections are outbound-initiated, meaning no open inbound listening ports are required, which keeps infrastructure invisible to port scans and unauthorized discovery. Encryption keys remain under the customer's control, as Atsign operates on a non-custodial model and does not hold or access user keys. Atsign offers two primary products: - NoPorts: A product for operations teams that enables authenticated, encrypted remote access to existing infrastructure (servers, databases, operational systems) without open inbound ports, VPN complexity, or firewall reconfiguration. - AI Architect: A tool for builders and architects to model identities, authority, data flows, policies, and communication paths for AI agent systems and connected applications before code is generated. The platform addresses three main use cases: securing verifiable AI agent systems with policy-driven network boundaries, connecting distributed edge devices and smart products across disparate networks, and enabling secure remote operations access to internal systems. Target users include software architects, engineers, CISOs, and executives in organizations managing distributed systems, IoT/edge deployments, or enterprise AI agent workflows. The platform is positioned as an alternative to VPNs, reverse proxies, and perimeter-based security approaches.