[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Security](./puppeteer.protocol.security.md) > [CertificateSecurityState](./puppeteer.protocol.security.certificatesecuritystate.md) > [certificateHasSha1Signature](./puppeteer.protocol.security.certificatesecuritystate.certificatehassha1signature.md) ## Protocol.Security.CertificateSecurityState.certificateHasSha1Signature property True if the certificate has a SHA1 signature in the chain. Signature: ```typescript certificateHasSha1Signature: boolean; ```