Google Online Security Blog: Modernizing Transport Security

Modernizing Transport Security

15 октомври 2018 г.

Posted by David Benjamin, Chrome networking*Updated on October 17, 2018 with details about changes in other browsersTLS 1.0TLS 1.2now brokenPCI-DSS compliantdocumentAppleMicrosoftMozilla

TLS 1.2 or later.

An ECDHE- and AEAD-based cipher suite. AEAD-based cipher suites are those using AES-GCM or ChaCha20-Poly1305. ECDHE_RSA_WITH_AES_128_GCM_SHA256 is the recommended option for most sites.

The server signature should use SHA-2. Note this is not the signature in the certificate, made by the CA. Rather, it is the signature made by the server itself, using its private key.

The older options—CBC-mode cipher suites, RSA-encryption key exchange, and SHA-1 online signatures—all have known cryptographic flaws. Each has been removed in the newly-published TLS 1.3, which is supported in Chrome 70. We retain them at prior versions for compatibility with legacy servers, but we will be evaluating them over time for eventual deprecation.

None of these changes require obtaining a new certificate. Additionally, they are backwards-compatible. Where necessary, servers may enable both modern and legacy options, to continue to support legacy clients. Note, however, such support may carry security risks. (For example, see the DROWN, FREAK, and ROBOT attacks.)

Over the coming Chrome releases, we will improve the DevTools Security Panel to point out deviations from these settings, and suggest improvements to the site’s configuration.

Enterprise deployments can preview the TLS 1.0 and 1.1 removal today by setting the SSLVersionMin policy to “tls1.2”. For enterprise deployments that need more time, this same policy can be used to re-enable TLS 1.0 or TLS 1.1 until January 2021.

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