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Link encryption is an approach to communications security that encrypts and decrypts all traffic at each end of a communications line (e.g. a teleprinter circuit or the line between two network switches). It contrasts with end-to-end encryption where messages are encrypted by the sender at the point of origin and only decrypted by the intended receiver. Link encryption offers a couple of advantages: * encryption is automatic so there is less opportunity for human error. * if the communications link operates continuously and carries an unvarying level of traffic, link encryption defeats traffic analysis. On the other hand, end-to-end encryption ensures only authorized persons see the plaintext. Link encryption can be used with end-to-end systems by superencrypting the messages. Bulk encryption refers to encrypting a large number of circuits at once, after they have been multiplexed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Link encryption」の詳細全文を読む スポンサード リンク
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