[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Security](./puppeteer.protocol.security.md) > [CertificateSecurityState](./puppeteer.protocol.security.certificatesecuritystate.md) > [protocol](./puppeteer.protocol.security.certificatesecuritystate.protocol.md) ## Protocol.Security.CertificateSecurityState.protocol property Protocol name (e.g. "TLS 1.2" or "QUIC"). Signature: ```typescript protocol: string; ```