[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Security](./puppeteer.protocol.security.md) > [CertificateSecurityState](./puppeteer.protocol.security.certificatesecuritystate.md) > [mac](./puppeteer.protocol.security.certificatesecuritystate.mac.md) ## Protocol.Security.CertificateSecurityState.mac property TLS MAC. Note that AEAD ciphers do not have separate MACs. Signature: ```typescript mac?: string; ```