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It has been suggested that this article or section be merged into Disk encryption. (Discuss) Look up on-the-fly encryption or OTFE in Wiktionary, the free dictionary. On-the-fly encryption (OTFE), also known as Real-time Encryption, is a method used by some encryption programs, for example, disk encryption software. "On-the-fly" refers to the fact that the files are accessible immediately after the key is provided, and the entire volume is typically mounted as if it were a physical drive, making the files just as accessible as any unencrypted ones. To be transparent to the end user, on-the-fly encryption usually requires the use of device drivers to enable the encryption process. Although administrator access rights are normally required to install such drivers, encrypted volumes can typically be used by normal users without these rights. On-the-fly encryption also means that data is automatically encrypted or decrypted right before it is loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. The entire file system within the volume is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc.). In general, every method in which data is transparently encrypted on write and decrypted on read can be called on-the-fly encryption (OTFE). Usage Many companies have developed data encryption or file encryption software for Personal Computers (PCs) and Personal Digital Assistants (PDAs) which employ On-the-fly-encryption technology to encrypt your files and folders. These file encryption software create one or more "Virtual Disks" on your hard drive that transparently and securely encrypt data before it store on your system's hard drive. Benefits Some of the benefits of using on-the-fly encryption are listed below: Encryption and decryption happens on the fly, which saves time. It is the fastest encryption method. Data is decrypted in RAM and does not require you to save files to a drive. Encrypted data is protected from being accessed/modified by unauthorized users. Protected data is highly portable—ideal for use with USB flash drives. No limit of the numbers of files and folders protected. See also Cryptography portal Disk encryption Disk encryption software Comparison of disk encryption software This cryptography-related article is a stub. You can help Wikipedia by expanding it. v • d • e