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Re: SSL ciphers, disable or not to disable RC4?

Jeffrey Walton
January 09, 2014 04:54AM
On Thu, Jan 9, 2014 at 4:29 AM, <Pekka.Panula@sofor.fi> wrote:
> Hi
>
> My current values in my nginx configuration for ssl_protocols/ciphers what i
> use is this:
>
> ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
> ssl_ciphers RC4:HIGH:!aNULL:!MD5;
> ssl_prefer_server_ciphers on;
>
> What are todays recommendations for ssl_ciphers option for supporting all
> current OSes and browsers, even Windows XP users with IE?
> Can i disable RC4?
>
The paper of interest is from AlFardan, Bernstein, et al: "On the
Security of RC4 in TLS and WPA"
(http://cr.yp.to/streamciphers/rc4biases-20130708.pdf‎). From the
paper:

... While the RC4 algorithm is known to have a
variety of cryptographic weaknesses (see [26]
for an excellent survey), it has not been previously
explored how these weaknesses can be exploited
in the context of TLS. Here we show that new and
recently discovered biases in the RC4 keystream
do create serious vulnerabilities in TLS when using
RC4 as its encryption algorithm.

I don't believe there's a need for SSLv3 anymore either. TLSv1.0 is
pretty much ubiquitous, and its at nearly 100% for modern browser,
clients and servers.
https://en.wikipedia.org/wiki/Transport_Layer_Security#Applications_and_adoption.

You also migth want to include "!eNULL:!ADH:!ECADH:!MEDIUM:!LOW:!EXP'.
eNULL is great for performance, but it has a few problems for privacy.

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Subject Author Posted

SSL ciphers, disable or not to disable RC4?

Anonymous User January 09, 2014 04:30AM

Re: SSL ciphers, disable or not to disable RC4?

nano January 09, 2014 04:44AM

Re: SSL ciphers, disable or not to disable RC4?

Jeffrey Walton January 09, 2014 04:54AM

RE: SSL ciphers, disable or not to disable RC4?

Lukas Tribus January 09, 2014 04:54AM

Re: SSL ciphers, disable or not to disable RC4?

Jeffrey Walton January 09, 2014 05:06AM

PHP below server root not served

nano January 09, 2014 05:26AM

Re: PHP below server root not served

Richard Stanway January 09, 2014 05:30AM

Re: PHP below server root not served

nano January 09, 2014 05:34AM

Re: PHP below server root not served

Francis Daly January 09, 2014 05:56AM

Re: PHP below server root not served

nano January 09, 2014 06:46AM

Re: PHP below server root not served

nano January 09, 2014 07:42AM

Re: PHP below server root not served

B.R. January 09, 2014 08:00AM

Re: PHP below server root not served

nano January 09, 2014 08:52AM

Re: PHP below server root not served

Francis Daly January 09, 2014 04:00PM

Re: PHP below server root not served

nano January 09, 2014 10:08PM

Re: PHP below server root not served

Francis Daly January 10, 2014 04:38AM

Re: PHP below server root not served

nano January 10, 2014 06:40AM

Re: PHP below server root not served

Francis Daly January 10, 2014 10:36AM

Re: PHP below server root not served

nano January 12, 2014 05:28AM

Re: PHP below server root not served

Francis Daly January 14, 2014 05:14PM

Re: PHP below server root not served

Valentin V. Bartenev January 15, 2014 02:20PM

Re: PHP below server root not served

nano January 10, 2014 04:38AM

Re: PHP below server root not served

nano January 09, 2014 09:44AM

Re: PHP below server root not served

Jim Ohlstein January 09, 2014 12:14PM

Re: PHP below server root not served

nano January 09, 2014 12:30PM

Re: SSL ciphers, disable or not to disable RC4?

Axel January 12, 2014 12:44PM

Re: SSL ciphers, disable or not to disable RC4?

Darren Pilgrim January 12, 2014 02:10PM

Re: SSL ciphers, disable or not to disable RC4?

Axel January 13, 2014 04:02AM



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