The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2001
Filed:
Sep. 16, 1997
Peter Brundrett, Seattle, WA (US);
Praerit Garg, Bellevue, WA (US);
Jianrong Gu, Bellevue, WA (US);
James W. Kelly, Jr., Redmond, WA (US);
Keith S. Kaplan, Bothell, WA (US);
Robert P. Reichel, Redmond, WA (US);
Brian Andrew, Redmond, WA (US);
Gary D. Kimura, Kirkland, WA (US);
Thomas J. Miller, Bellevue, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
A system and method for encryption and decryption of files. The system and method operate in conjunction with the file system to transparently encrypt and decrypt files in using a public key-private key pair encryption scheme. When a user puts a file in an encrypted directory or encrypts a file, all data writes to the disk for that file are encrypted with a random file encryption key generated from a random number and encrypted with the public key of a user and the public key of at least one recovery agent. The encrypted key information is stored with the file, whereby the user or a recovery agent can decrypt the file data using the private key thereof. When a proper private key is used, encrypted reads from the disk are decrypted transparently by the file system and returned to the user.