Issues in the design of a key distribution centre

Problems associated with the secure distribution of cryptographic keys within a communication environment are discussed. The role and functioning of a key distribution center is considered, both in the context of single key cryptosystems (Data Encryption Standard) and in that of public key cryptosystems. Reference is made to the design criteria which arise from a requirement for digital signatures and to the particular constraints which are imposed when users within the domains or different key distribution centers wish to communicate securely.