http://cyruslab.wordpress.com/2012/06/07/centos-6-2-mcrypt-and-libmcrypt-not-found-in-yum-repolist/
http://www.didiao.net/?p=373
http://www.linuxquestions.org/questions/linux-software-2/centos-6-3-where-is-libmcrypt-devel-4175416225/
http://www.kelvinwong.ca/2009/12/06/install-libmcrypt-and-php-mcrypt-on-centos-5-3-without-losing-too-much-hair/
http://stackoverflow.com/questions/639680/whats-needed-for-phps-mcrypt-decrypt
http://stackoverflow.com/questions/10956274/encrypt-file-using-aes-and-pycrypto-in-python-3
http://stackoverflow.com/questions/3154998/pycrypto-problem-using-aesctr
http://stackoverflow.com/questions/3422759/php-aes-encrypt-decrypt