In connection with the key management scheme discussed by Ehrsam et al. in the preceding paper, 1 we have described two kinds of keys: • Data-encrypting keys, which protect either data in transit (primary communication keys, or session keys) or stored data (primary file keys, or file keys); • Key-encrypting keys, which encipher other keys—for example, host master keys, secondary communication keys (of which the terminal master key is a special case), and secondary file keys.
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Matyas et al. (1978) studied this question.
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