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Diffie-Hellman Key Exchange in plain English Diffie-Hellman is a way of generating a shared secret between two people in such a way that the secret can't be seen by observing the communication That's an important distinction: You're not sharing information during the key exchange, you're creating a key together This is particularly useful because you can use this technique to create an encryption key with someone, and then start
Command to check a website is vulnerable to Logjam First off, Logjam only applies to 'classic' aka integer aka modp aka Zp DH (E), not ever ECDH (E) Second, you were apparently using OpenSSL 1 1 1 which supports TLS1 3 -- which google also did and does, so by default it was selected and in TLS1 3 ciphersuites no longer control (or even influence) keyexchange If you use -no_tls1_3 -cipher EDH (or better -cipher DHE which has been preferred
How can a RSA-2048 certificate be vulnerable to logjam attack? Most likely I am missing some fundamentals: Our web servers are secured with TLS encryption We use RSA-2048 bit certificates The logjam attack targets the DH algorithm How can our web servers be
Logjam definition question - Information Security Stack Exchange In Logjam attack, the client presents a list of cipher suites (includes some strong cipher and EXPORT cipher as well) A Man-in-the-Middle attack will change this request such that highest grade cipher in the request becomes the EXPORT grade cipher The server doesn't want to reject this request (it could be an eCommerce website and server don't want to lose business), so the shared secret is
Diffie–Hellman key exchange in TLS 1. 3 I am reading about the Diffie–Hellman key exchange in TLS 1 3 So the first step here is that the two parts Alice and Bob t agree on a large prime p and a nonzero integer g modulo p Then Alice an
tls - Information Security Stack Exchange Secure against what? And in what context? Do you realise that you are comparing DH with RSA, which is not an apples-to-apples comparison?
Am I protected from Log4j vulnerability if I run Java 8u121 or newer . . . No, you really need to update log4j Here is an excerpt from LunaSec's announcement: According to this blog post (see translation), JDK versions greater than 6u211, 7u201, 8u191, and 11 0 1 are not affected by the LDAP attack vector In these versions com sun jndi ldap object trustURLCodebase is set to false meaning JNDI cannot load remote code using LDAP However, there are other attack