[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Security](./puppeteer.protocol.security.md) > [CertificateSecurityState](./puppeteer.protocol.security.certificatesecuritystate.md) > [keyExchange](./puppeteer.protocol.security.certificatesecuritystate.keyexchange.md) ## Protocol.Security.CertificateSecurityState.keyExchange property Key Exchange used by the connection, or the empty string if not applicable. Signature: ```typescript keyExchange: string; ```