EaseFilter File System Encryption Ffilter Ddriver SDK provides a comprehensive solution for transparent file level encryption. It allows developers to create transparent encryption products which can encrypt or decrypt files on-the-fly, it can allow only authorized users or processes to access the encrypted files. Supported strong cryptographic algorithm Rijndael is a high security algorithm which was chosen by the National Institute of Standards and Technology (NIST) as the new Advanced Encryption Standard (AES), it can support key lengths 128-bits,192-bits and 256-bits.