Systems and methods for identity-based encryption and related cryptographic techniques
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United States of America Patent
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Sep 26, 2006
Grant Date -
May 1, 2003
app pub date -
Aug 13, 2002
filing date -
Aug 13, 2001
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Abstract
A method and system for encrypting a first piece of information M to be sent by a sender [100] to a receiver [110] allows both sender and receiver to compute a secret message key using identity-based information and a bilinear map. In a one embodiment, the sender [100] computes an identity-based encryption key from an identifier ID associated with the receiver [110]. The identifier ID may include various types of information such as the receiver's e-mail address, a receiver credential, a message identifier, or a date. The sender uses a bilinear map and the encryption key to compute a secret message key g.sub.ID.sup.r, which is then used to encrypt a message M, producing ciphertext V to be sent from the sender [100] to the receiver [110] together with an element rP. An identity-based decryption key d.sub.ID is computed by a private key generator [120] based on the ID associated with the receiver and a secret master key s. After obtaining the private decryption key from the key generator [120], the receiver [110] uses it together with the element rP and the bilinear map to compute the secret message key g.sub.ID.sup.r, which is then used to decrypt V and recover the original message M. According to one embodiment, the bilinear map is based on a Weil pairing or a Tate pairing defined on a subgroup of an elliptic curve. Also described are several applications of the techniques, including key revocation, credential management, and return receipt notification.
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- THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY;THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Boneh, Dan | Palo Alto, CA | 37 | 2188 |
Franklin, Matthew | Davis, CA | 14 | 393 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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