This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Does Mozilla support 128-bit encryption?

  • 4 fhreagra
  • 9 leis an bhfadhb seo
  • 1 view
  • Freagra is déanaí ó cor-el

more options

To use IRS Business Services Online (http://www.socialsecurity.gov/employer/bsohbnew.htm), 128-bit encryption is needed. They say:

"To determine whether your browser supports 128-bit encryption, select Help/About from your browser menu. Most browsers will display the phrase ?128-bit encryption? or "128-bit cipher strength.? If you are unsure whether your browser supports 128-bit encryption, contact the software company that developed the browser."

But I can't seem to find this information on the about page or in online articles about encryption. Would you please help?

To use IRS Business Services Online (http://www.socialsecurity.gov/employer/bsohbnew.htm), 128-bit encryption is needed. They say: "To determine whether your browser supports 128-bit encryption, select Help/About from your browser menu. Most browsers will display the phrase ?128-bit encryption? or "128-bit cipher strength.? If you are unsure whether your browser supports 128-bit encryption, contact the software company that developed the browser." But I can't seem to find this information on the about page or in online articles about encryption. Would you please help?

Réiteach roghnaithe

Firefox will match the level of encryption the website uses, and Firefox is capable of higher encryption than 128-bit (256-bit if that is what the website uses).

It depends on which order the server offers. If the server offers 128 bit with a higher priority that 256 bit then Firefox will only select 256 bit if you would disable the 128 bit ciphers.

See also https://www.fortify.net/cgi/ssl_2.pl

Read this answer in context 👍 11

All Replies (4)

more options

Réiteach Roghnaithe

Firefox will match the level of encryption the website uses, and Firefox is capable of higher encryption than 128-bit (256-bit if that is what the website uses).

It depends on which order the server offers. If the server offers 128 bit with a higher priority that 256 bit then Firefox will only select 256 bit if you would disable the 128 bit ciphers.

See also https://www.fortify.net/cgi/ssl_2.pl

more options

The Firefox browser uaseragents used to have a U to denote it is a browser with strong encryption and this was removed as of Firefox 4.0. It was removed as it really was not needed anymore anyways for several years now and the browser we know as Firefox supported 128-bit if not 256-bit since it was Phoenix 0.1 back in Sept 2002. Yes the browser was out for two years before the so called November 9 2004 release date.

https://hacks.mozilla.org/2010/09/final-user-agent-string-for-firefox-4/ http://en.wikipedia.org/wiki/User_agent#Encryption_strength_notations

Athraithe ag James ar

more options

So how does one tell if 128 bit encryption is being used by my Vista machine using FoxFire 22.0? Is there a notification some where saying the level of encryption being used?

more options

Current Firefox releases can't even go below 128 bit, SSL2 that supported this have been removed quite a few releases now (Firefox 8 dropped support for SSL2).

128 bit is the minimum that you can use with Firefox and you can only go higher (e.g. 168 or 256).
128 bit shouldn't be used these days and servers that only support 128 bit should update their software.

Firefox supports AES-256 since 2002, so that is already more than 10 years.