( ) is used to ensure the confidentiality, integrity and authenticity of the two end points in the private network。
ACertificate
BEncryption
CTunnel
DPresentation
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) is used to ensure the confidentiality, integrity and authenticity of the two end points in the pr
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aidy used in key（ ）and nonrepudiation,thereby providing confidentiality and authentication．The hash
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t to reside largely at the end points of the network-the computers-while the specialized routing co
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t to reside largely at the end points of the network-the computers-while the specialized routing co
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t to reside largely at the end points of the network-the computers-while the specialized routing co