Peer Certificate

Definitions

1. The digital certificate presented by the other side of a secure connection, such as a server certificate shown to a client or a client certificate shown to a server in mTLS. Validating the peer certificate is a core step in confirming identity and establishing trust in certificate-based protocols.

   In plain English: The certificate presented by the other side of a secure connection.

   Example: "The service rejected the connection because the peer certificate had expired and no valid alternate chain was available."

Related Terms

• Man-in-the-Middle Attack
• Certificate Authority
• SSL Pinning
• TLS Mutual Authentication
• Certificate Chain
• Client Certificate
• Keystore
• Multi-Domain Certificate
• OpenSSL Security
• Public Certificate