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:
Jan. 10, 2012
Filed:
Feb. 03, 2006
Susan R. Hohenberger, Cambridge, MA (US);
Kevin Fu, Hadley, MA (US);
Giuseppe Ateniese, Timonium, MD (US);
Matthew Green, Baltimore, MD (US);
Susan R. Hohenberger, Cambridge, MA (US);
Kevin Fu, Hadley, MA (US);
Giuseppe Ateniese, Timonium, MD (US);
Matthew Green, Baltimore, MD (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
The Johns Hopkins University, Baltimore, MD (US);
Abstract
A method for performing unidirectional proxy re-encryption includes generating a first key pair comprising a public key (pk) and a secret key (sk) and generating a re-encryption key that changes encryptions under a first public key pkinto encryptions under a second public key pkas rk. The method further includes performing one of the group consisting of encrypting a message m under public key pkproducing a ciphertext c, re-encrypting a ciphertext cusing the re-encryption key rkthat changes ciphertexts under pkinto ciphertexts under pkto produce a ciphertext cunder pk, and decrypting a ciphertext cunder pkto recover a message m. The method also includes encrypting a message m under a public key pk producing a first-level ciphertext cthat cannot be re-encrypted, and decrypting a first-level ciphertext cusing secret key sk.