作者: Adrian Spalka , Jan Lehnhardt
DOI:
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摘要: The invention relates to a client computer (10) for querying database stored on server (22) via network (48), the being coupled wherein comprises set of first relations (32; 34; 36), each relation 36) in data items, items are encrypted with respective cryptographic key (18) relation, form partially ordered partial order formed respect said non-encrypted form.