cryptanalysis question: Does knowing some of the content of the message make the full message vulnerable to decryption?

Donald Morgan Jr. donaldmorganjr at
Thu Jan 30 22:15:08 CET 2014

If you know a user has a signature that they use to always end a message
with, does that data aid in the decryption of the file? Would this exploit
be applicable to symmetric encryption methods as well?
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