Abstract: A system and methods are provided for protecting private data items in a relational database, including: storing non-private attributes of entities of a first entity type in a first non-private table and storing one or more non-private attributes of entities of a second entity type in a second non-private table; and storing private attributes of entities of both the first and second entity types in a private table, wherein each record of the private table includes a single private-attribute field and a scrambled field, wherein the scrambled field is a transformation of an entity type field, a record identifier field, and an attribute identifier field, wherein the entity type field identifies an entity type of the given entity, the record identifier field identifies a corresponding record of a non-private table, and the attribute identifier field indicates an identifier of the private attribute whose value is stored in the private-attribute field.

Abstract: A knowledge tool, which includes a binary dataset for representing relationship patterns between objects and methods of its use. The use of the binary representation is based on an algorithm of data clustering according to binary similarity indices, which are derived from the binary matrix. Applications which are based on the binary representation and its compression capability include data mining, text mining, search engines, pattern recognition, enhancing data exchange rate between computerized devices, database implementation on hardware, saving storage space and adaptive network addressing.

Abstract: A knowledge tool, which includes a binary dataset for representing relationship patterns between objects and methods of its use. The use of the binary representation is based on an algorithm of data clustering according to binary similarity indices, which are derived from the binary matrix. Applications which are based on the binary representation and its compression capability include data mining, text mining, search engines, pattern recognition, enhancing data exchange rate between computerized devices, database implementation on hardware, saving storage space and adaptive network addressing.