Re: [TLS] [EXTERNAL] Re: Regarding draft-bartle-tls-deprecate-ffdhe

2021-03-09 Thread Brian Smith
Andrei Popov wrote: > Hi Brian, > > > >- Look at Windows Server 2012 and similar legacy products that are in >widespread use, which don't support any PFS cipher suites except FFDHE. > > Windows Server 2012/Windows 8 support both TLS_ECDHE_ECDSA and > TLS_ECDHE_RSA cipher suites: TLS

Re: [TLS] [EXTERNAL] Re: Regarding draft-bartle-tls-deprecate-ffdhe

2021-03-08 Thread David Benjamin
Chrome dropped TLS 1.2 DHE nearly five years ago now. I don't have data on the current DHE-to-RSA conversion, but I can tell you what it was then. When we put it under a fallback for measurement, only 2% of connections negotiated DHE. Of that 2%, 95% used 1024-bit DHE. That means we really only

Re: [TLS] [EXTERNAL] Re: Regarding draft-bartle-tls-deprecate-ffdhe

2021-03-08 Thread Andrei Popov
Hi Brian, * Look at Windows Server 2012 and similar legacy products that are in widespread use, which don't support any PFS cipher suites except FFDHE. Windows Server 2012/Windows 8 support both TLS_ECDHE_ECDSA and TLS_ECDHE_RSA cipher suites: TLS Cipher Suites in Windows 8 - Win32 apps |

Re: [TLS] [EXTERNAL] Re: Regarding draft-bartle-tls-deprecate-ffdhe

2021-03-08 Thread Andrei Popov
TLS_DHE is weak when used with interoperable key lengths. It also causes interop issues dues to several instances of under-specification (leading zeros, lack of group negotiation). I'm in favor of deprecating TLS_DHE. Cheers, Andrei -Original Message- From: TLS On Behalf Of Martin