Generation, distribution, and installation of cryptographic keys
Stephen M. Matyas, Craig H. Meyer · IBM Systems Journal · 1978
In connection with the key management scheme discussed by Ehrsam et al. in the preceding paper,1we 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.