This white-box is one of the challenges from the PlaidCTF 2013.
Ref: http://play.plaidctf.com/files/drmless.tgz-e9f85853ac856d7ed7a5a8c6e807955f07bbfa7a (dead link)
Copy: http://shell-storm.org/repo/CTF/PlaidCTF-2013/Binary/drmless-250/
target
contains the original challenge and instructions how to use it.DCA
contains the DCA attack against this challenge, unsuccessful so far.DFA
contains the DFA attack against this challenge.DFA2
contains the DFA attack against this challenge, another variant.