Re: Man in the middle attacks ?

2001-11-12 Thread J. Johnson
[In response to Pascal Janse van Vuuren, 13 Nov 2001] The "RSA Security's Official Guide to Cryptography" has pretty good discussion of various kinds of attacks and how they can be dealt with. See p108 for a discussion on using Diffie-Hellman based key exchange. (Doesn't mention OpenSSL, though.

Re: Man in the middle attacks ?

2001-11-12 Thread Eric Rescorla
"Pascal Janse van Vuuren" <[EMAIL PROTECTED]> writes: > I'm not a real crypto expert. But, I'm facing a potential (?) > problem. I've used OpenSSL to negotiate a secure control channel > between two nodes of a private network. The generated private keys > are encrypted with a specific password. Na

Re: Man in the middle attacks ?

2001-11-12 Thread Keary Suska
Probably not, as long as the client can properly respond to a changed server key. For instance, in SSH2, the ssh client "remembers" the server's key on the first connection. The client can be configured to abort server connections when the key changes from a known value, or at the minimum the clie

Re: Man in the middle attacks

2001-02-06 Thread Louis LeBlanc
You are correct about IE 5.x not checking the CRL by default, but be careful in using this. I recently found a bug with Windows 95, 98, and NT where if you checked the box in Internet Options to tell IE to verify the CRL, it would do so, but if a CRL link was provided, all other certificate verif

Re: Man in the middle attacks

2001-02-05 Thread Michael H. Warfield
On Mon, Feb 05, 2001 at 09:12:42AM -0500, Michael T. Babcock wrote: > Greg Stark wrote: > > The attack you are referring to is defeated by the client checking the > > identity that is contained in the certificate. I do not know why you are so > > sure that this checking is not normally done. IE a

Re: Man in the middle attacks

2001-02-05 Thread Michael T. Babcock
Greg Stark wrote: > The attack you are referring to is defeated by the client checking the > identity that is contained in the certificate. I do not know why you are so > sure that this checking is not normally done. IE and Netscape Nav. do it, > for example [...] IE 5.x does not, by default, ch

Re: Man in the middle attacks

2001-02-04 Thread Greg Stark
I am replying to -users even though the original post was sent to -dev. First, a nit on terminology. The protocols should be referred to as the SSL protocols or perhaps more accurately the SSL/TLS protocols, not the openssl protocol. OpenSSL is an implementation of these protocols. The attack yo