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Recipient and message authentication method and system
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Dynamic frequency and time voice encryption system and method
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Digital cryptographic system and testing thereof
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Portable electronic cryptographic device
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Multi-mode digital enciphering system
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Multi-mode digital enciphering system
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Multi-mode digital enciphering system with repeated priming sequences
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Random digital code generator
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Digital cryptographic system having synchronous and asynchronous capabilities
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System for locally enciphering prime data
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Multi-mode digital enciphering system
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Synchronous digital data scrambling system
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Voice security method and system
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Voice security method and system
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Voice security method and system
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Digital cryptographic system and method
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Voice security method and system
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Digital data ciphering technique
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Random digital code generator
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