Re: [Cryptography] forward-secrecy >=2048-bit in legacy browser/servers? (Re: RSA equivalent key length/strength)

2013-09-26 Thread Peter Gutmann
Adam Back writes: >Is there a possibility with RSA-RSA ciphersuite to have a certified RSA >signing key, but that key is used to sign an RS key negotiation? Yes, but not in the way you want. This is what the 1990s-vintage RSA export ciphersuites did, but they were designed so you couldn't use t

Re: [Cryptography] forward-secrecy >=2048-bit in legacy browser/servers? (Re: RSA equivalent key length/strength)

2013-09-26 Thread Peter Fairbrother
On 25/09/13 13:25, Adam Back wrote: On Wed, Sep 25, 2013 at 11:59:50PM +1200, Peter Gutmann wrote: Something that can "sign a new RSA-2048 sub-certificate" is called a CA. For a browser, it'll have to be a trusted CA. What I was asking you to explain is how the browsers are going to deal with