FileSender secure passwords

FileSender is a secure and private way to share very large files with end-to-end encryption. It can be self-hosted or offered as service. This project addresses password security in a number of manners: key generation optimization, offering a PBKDF2 user interface and password improvements - some browsers like Microsoft Edge and Internet Explorer do not support PBKDF2 for generating a cryptographic key from a user supplied password. This requires an alternative solution for those browsers.