This is the Definition of Free Cultural Works , and when describing your work, we encourage you to make reference to this definition, as in, "This is a freely licensed work, as explained in the Definition of Free Cultural Works ." If you do not like the term "Free Cultural Work," you can use the generic term "Free Content," or refer instead to one of the existing movements that express similar freedoms in more specific contexts. We also encourage you to use the Free Cultural Works logos and buttons , which are in the public domain.
Another approach is to actually break the cipher through cryptanalysis ; finding a weakness in the cipher that can be exploited with a complexity less than brute force. The challenge of successfully attacking a cipher is easier of course if the cipher itself is flawed in the first place. There have always been suspicions that interference from the National Security Agency weakened the Data Encryption Standard algorithm , and following revelations from former NSA analyst and contractor Edward Snowden, many believe they have attempted to weaken encryption products and subvert cryptography standards.