发明名称 |
HIERARCHICAL IDENTITY-BASED ENCRYPTION AND SIGNATURE SCHEMES |
摘要 |
Methods are provided for encoding and decoding a digital message between a sender and a recipient in a system including a plurality of private key generators ("PKGs"). The PKGs include at least a root PKG and n lower-level PKG in the hierarchy between the root PKG and the recipient. A root key generation secret is selected and is known only to the root PKG. A root key generation parameter is generated based on the root key generation secret. A lower-level key generation secret is selected for each of the n lower-level PKGs, wherein each lower-level key generation secret is known only to its associated lower-level PKG. A lower-level key generation parameter also is generated for each of the n lower-level PKGs using at least the lower-level key generation secret for its associated lower-level private key generator. The message is encoded to form a ciphertext using at least the root key generation parameter and recipient identity information associated with the recipient. A recipient private key is generated such that the recipient private key is related to at least the root key generation secret, one or more of the n lower-level key generation secrets, and the recipient identity information. The ciphertext is decoded to recover the message using at least the recipient private key.
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申请公布号 |
US2007050629(A1) |
申请公布日期 |
2007.03.01 |
申请号 |
US20060552076 |
申请日期 |
2006.10.23 |
申请人 |
GENTRY CRAIG B;SILVERBERG ALICE |
发明人 |
GENTRY CRAIG B.;SILVERBERG ALICE |
分类号 |
H04L9/00;H04L9/08;H04L9/30;H04L9/32 |
主分类号 |
H04L9/00 |
代理机构 |
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地址 |
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