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[perindu]

Logjam attack using Diffie-Hellman key exchange.

more info at

https://weakdh.org/

Simple test at

https://weakdh.org/sysadmin.html
or
https://www.ssllabs.com/ssltest

simple fixed
http://serverfault.com/questions/693241/how-to-fix-logjam-vulnerability-in-apache-httpd