On May 19th, 2015 a team of researchers (Henninger et. al) published a paper with the title “Imperfect Forward Secrecy: How Diffie-Hellman Fails in Practice”. The paper can be divided in two sections: 1) discrete logs on a 512-bit Diffie-Hellman (DH) group, and 2) a new attack against the Transport Layer Security (TLS) protocol. We’ll review both sections. The discrete logs on a 512-bit Diffie-Hellman group The researchers implemented a practical attack against the Diffie-Hellman protocol, when used with a key size of 512-bit. They also theorized on the complexity (time and [...]
from Cisco Blog » Security http://ift.tt/1FZTn8x
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