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Title:
IDENTITY-BASED DECRYPTION
Document Type and Number:
WIPO Patent Application WO/2012/129640
Kind Code:
A3
Abstract:
Devices and methods are provided for managing identity-based decryption of digital content. A message sender ("Alice") uses a random key (Krand) to encrypt message content for a message recipient ("Bob"). Then Alice uses the public key of a message decryption service provider ("Carmen") to generate a wrapped key ciphertext comprising the Krand and authentication information associated with Bob. Alice then sends a message text containing the encrypted message content and the wrapped key ciphertext to Bob, who in turn sends the wrapped key ciphertext to Carmen along with his authentication information. Carmen then uses her private key to process the wrapped key ciphertext to decrypt the Krand and Bob' s authentication information. If the authentication information provided by Bob matches the decrypted authentication information, then Carmen sends the decrypted Krand to Bob, who uses it to decrypt the encrypted message content.

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Inventors:
BROWN DANIEL RICHARD L (CA)
Application Number:
PCT/CA2011/050181
Publication Date:
December 06, 2012
Filing Date:
April 01, 2011
Export Citation:
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Assignee:
CERTICOM CORP (CA)
BROWN DANIEL RICHARD L (CA)
International Classes:
H04L9/30; H04L9/32; H04W12/04; H04W12/06
Foreign References:
US20090034714A92009-02-05
US20060095770A12006-05-04
US6275936B12001-08-14
Other References:
KHURANA, H. ET AL.: "On the Risks of IBE", FIFTH INTERNATIONAL WORKSHOP ON APPLIED PKC (IWAP), November 2006 (2006-11-01), DALIAN, CHINA, XP055128790
BROWN, D.: "Identity-Based Decryption", 31 October 2011 (2011-10-31), XP061004909, Retrieved from the Internet
Attorney, Agent or Firm:
RIDOUT & MAYBEE LLP (10th FloorToronto, Ontario M5V 2M2, CA)
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