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A New Kind of Cipher That Would Take Millions of Years to Break. MARTIN GARDNER. Scientific American . 1977
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EntityModelingintheMLSRelationalModel. KENSMITH,MARIANNEWINSLETT. IntConfonVeryLargeDataBases . 1992
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Current Status of R&D in Trusted Database Management System. BHAVANI THURAISINGHAM. ACM SIGMOD Record . 1992
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Breaking into the Internet. NIGEL HAWKES. London Times, March 18th . 1996
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A Method for Obtaining Digital Signatures and Public Key Cryptosystems. R L RIVEST,A SHAMIR,L ADLEMAN. Communications of the ACM . 1978
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USDEPARTMENTofCONNERCE NationalBureauofStandands. DataEncryptionStandard,FederalInformationProcessingStandardsPublication46 . 1977
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TowardaMulti-LevelSecureRelationalDataModel. SUSHILJAJODIA ,,RAVISANDHU. IntConfonManagementofData . 1991
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An Authorization Mechanism for a Relational Data Base System. PATRICIA P,GRIFFITHS,BRADFORD W WADE. ACM Transactions on Database Systems . 1976