Private retrieval of digital objects

专利名称：Private retrieval of digital objects
发明人：Bao Feng,Robert Deng Huijie,Feng Peirong
申请号：US09834106
申请日：20010413
公开号：US07231047B2
公开日：
20070612
专利内容由知识产权出版社提供
专利附图：
摘要：A database () maintains one or more groups () of digital objects (). A user ()wishes to retrieve one or more digital objects () from the database (), without the database () being able to determine which particular digital objects () have been
retrieved. In addition, the database () should not allow the user () to retrieve any digital
objects () to which the user () has not been granted access. The user () requests the groups () containing the digital objects () the user () wishes to download, but does not identify the digital objects () within each group () that the user () is interested in. Using a symmetric key cryptosystem, the database () generates a key () for and encrypts each digital object () in the requested group () into ciphertext (), and additionally encrypts each key (). The database () transmits the ciphertexts () and encrypted keys () to the user (). The user () identifies the keys () associated with the digital objects () of interest, and further encrypts the keys (), returning the changed keys () to the A database (). The database () reverses its encryption of the keys (), and transmits the partially decrypted keys () back to the user (). The user () then applies the user's () own decryption algorithm to the keys (), and then uses the decrypted keys () to decrypt the digital objects () of interest.
申请人：Bao Feng,Robert Deng Huijie,Feng Peirong
地址：Singapore SG,Singapore SG,San Jose CA US
国籍：SG,SG,US
代理机构：Morrison & Foerster LLP
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