Knowledge Base

F

Key Exchange Algorithm: anonymous Diffie-Hellman

Summary

Security

The anonymous Diffie-Hellman[404] key exchange[133] is a variant of Diffie-Hellman[99][100][101][102][103] key exchange that does not provide authenticity[75][76][77]. Lack of authentication causes that the identity of server cannot be proved, so connection is open for a man-in-the-middle attack[61].

Suggestion

Remove the cipher suite from the list of cipher suites supported by your server or replace the cipher suite with it's Ephemeral Diffie-Hellman[405][406][407][408] version.

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Config Snippets

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i
NGINX
OpenSSL version: 0.9.8+
ssl_ciphers …:!ADH
i
Apache
OpenSSL version: 0.9.8+
SSLCipherSuite …:!ADH

Affected Cipher Suites