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The Logjam (and Another) Vulnerability against Diffie-Hellman Key Exchange

About

The Logjam attack allows a man-in-the-middle attacker to downgrade vulnerable TLS connections to 512-bit export-grade cryptography. This allows the attacker to read and modify any data passed over the connection. The attack is reminiscent of the Freak attack, but is due to a flaw in the TLS protocol rather than an implementation vulnerability, and attacks a Diffie-Hellman key exchange rather than an RSA key exchange. The attack affects any server that supports DHE_EXPORT ciphers, and affects all modern web browsers. 8.4% of the Top 1 Million domains were initially vulnerable.

for more details

https://www.schneier.com/blog/archives/2015/05/the_logjam_and_.html
https://weakdh.org/
https://freakattack.com/
 

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