Keyfile
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In computers, Keyfile (key-file) is a digital file which stores a security key, usually for used for data encryption/decryption. Keyfiles are sometimes placed on one memory device so that when connected, the keyfile can be accessed and used to decrypt another memory device. They can also be used when individual files or folders are encrypted. Since the file can usually be copied or stolen, a keyfile is usually used in tandem with a password.[1]
Advantages
- Brute-force attacks are made much more difficult (a keyfile can contain thousands, millions, or even billions of characters--a much harder code to break than a simple password)
- Dictionary attacks are rendered useless
- Allows for multi-user shared access. Multiple people can have a unique "key" which permits certain tasks but can also restrict others.[1]
- A smartcard can be created containing a keyfile, so the physical card is needed to unlock data
Disadvantages
- Keyfiles can be stolen without the user's knowledge
- Keyfiles can be damages or deleted (accidentally or be design) preventing access
- Storage media on which the keyfile is stored can be damaged or destroyed, making the keyfile potentially inaccessible, and therefore preventing access