From the developer: "This file encryption software uses a secure 128 bit cipher incorporating the AES candidate Twofish algorithm to warrant the security of your valuable data. SecExFile integrates fully with Windows Explorer and features an easy to use intuitive user interface, allowing the one-click secure archival of single or multiple files. Encrypted archives utilize standard ZIP compression technology to minimize storage requirements and facilitate easy transmission of encrypted archives via email. Pro-active security guards against common cryptanalysis such as known plain text attacks. SecExFile is built on the Open SSL secure socket layer library."