With #959 all ciphers of the platform were enabled, but this also
includes several suites that are considered as very weak, even down to
NULL- and anon-ciphers which disable completely disable encryption
and/or authentication. Especially the anon-ciphers could be easily used
for a mitm-attack.
To remove all weak ciphers a blacklist with patterns of cipher-names was
added to Config.java. The blacklist is based on the "mandatory discards"
that Mozilla suggests to not use for TLS-servers because they are weak
or known to be broken.
https://wiki.mozilla.org/Security/Server_Side_TLS#Mandatory_discards
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