Abstract: Full disk encryption, which not only holds the secret of encrypted data but also conceals the meta data of disk structure, can give the more optimized defense against attack than file-system-level encryption as the tweakable enciphering mode introduced. However, the current disk encryption will raise dependence on the master key while broadening the coverage of confidential data,because the mount of data encrypted by single key will also be increased,Thus it eauses the key distribution problems whether the master key can be derived conveniently and how the workload of computation and storage will be reduced. ho solve this, a scheme of full disk encryption based on slide password lock was described and an analysis of environment and efficiency on the scheme was given.

Key words: Computer security,Full disk }ncryption,hwcakable block cipher,Key management