Knowledge Base

Finding

C

Encryption Algorithm: Triple DES (3DES, officially TDEA or Triple DEA)

Summary

Security

Encryption algorithm Triple DES[295][296][297] is a block cipher[78][79][80][81] which is still recognized as secure, but deprecated. It has multiple vulnerabilities[298][299][300][301] (eg: sweet32 attack[22][23][24][25], meet-in-the-middle attack[62], brute-force attack[54]) and it is considered as weak and disallowed by National Institute of Standards and Technology[470][471] after 2023.

Suggestion

Remove the cipher suite from the list of cipher suites supported by your server.

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Config Snippets

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i
NGINX
OpenSSL version: 0.9.8+
ssl_ciphers …:!3DES
i
Apache
OpenSSL version: 0.9.8+
SSLCipherSuite …:!3DES

Affected Cipher Suites