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CA1159920A
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Method and apparatus for securing data transmissions
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CA1159124A
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Method and apparatus for securing data transmissions
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US4357529A
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Multilevel security apparatus and method
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Multilevel security apparatus and method
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Multilevel security apparatus and method
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Method and apparatus for securing data transmissions
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Method and means for securing the distribution of encoding keys
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GB2047506A
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Method and apparatus for securing data transmissions
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US4283599A
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Method and apparatus for securing data transmissions
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Method and apparatus for securing data transmissions
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US4281215A
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Method and apparatus for securing data transmissions
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US4198619A
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Programmable security system and method
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CA1100593A
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Programmable security system and method
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US4140272A
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Optical card, system and method for securing personal identification data
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US4138057A
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Card, system and method for securing user identification data
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AU7752775A
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Personal verification system and method using plural code words and secret code word
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US3938091A
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Personal verification system
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NL7401440A
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Personal credit identification for telephone systems - uses combination of two identification codes compared with stored combination record
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CH594939A5
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Personal credit identification for telephone systems
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DE2401059A1
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Personal credit identification for telephone systems - uses combination of two identification codes compared with stored combination record
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