1) Mcrypt : This is an interface to the mcrypt library, which supports a wide variety of block algorithms such as DES, TripleDES, Blowfish (default), 3-WAY, SAFER-SK64, SAFER-SK128, TWOFISH, TEA, RC2 and GOST in CBC, OFB, CFB and ECB cipher modes. Additionally, it supports RC6 and IDEA which are considered "non-free". CFB/OFB are 8bit by default. 2) Mhash : These functions are intended to work with » mhash. Mhash can be used to create checksums, message digests, message authentication codes, and more. This is an interface to the mhash library. Mhash supports a wide variety of hash algorithms such as MD5, SHA1, GOST, and many others. 3) Simplexml : The SimpleXML extension provides a very simple and easily usable toolset to convert XML to an object that can be processed with normal property selectors and array iterators. 4) DOM : The DOM extension allows you to op erate on XML documents through the DOM API with PHP 5. 5) InnoDB storage engine : InnoDB is ...