Securing Agent-to-Agent (A2A) Communication

This article provides a detailed guide on securing agent-to-agent (A2A) communication in enterprise AI environments. It explains the A2A protocol, an open standard for interoperability between AI agents from different vendors, and highlights its deliberate omission of identity, credential provisioning, and authorization. The guide walks through how A2A works, the concrete security risks it leaves open (such as trust establishment and agent identity verification), and the controls needed to harden deployments before production. It emphasizes that while A2A provides the communication plumbing, security depends entirely on implementers. Topics include agent cards, client and remote agent interactions, and integration with existing enterprise identity infrastructure.