Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Patent
1997-06-30
2000-10-17
Gregory, Bernarr E.
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
380201, 380277, 380278, 713189, 713200, H04L 900
Patent
active
061346608
ABSTRACT:
A system enables a user to remove a file from a file system and from all backup tapes without ever mounting a single tape. When a file is backed up, it is first encrypted using a randomly generated key and then backed up. When the user wishes to remove the file from the backup tape, the key used to encrypt the file is deleted. Deleting the encryption key renders the data on the tape inaccessible. No one, including the file owner, can ever access the file again. The encrypt before-backup method is completely transparent to the user. Only the computer system's operating system knows which key was used to encrypt the file during backup. This ensures that when the operating system is instructed to delete the encryption key, the key is "lost" forever and thus the backed up files become unreadable. Unlike prior cryptographic file systems, the revoked backup files are inaccessible to both the user and others.
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Boneh Dan
Lipton Richard J.
Giordano Joseph
Gregory Bernarr E.
Telcordia Technologies Inc.
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