A DYNAMIC CRYPTOGRAPHIC KEY GENERATION AND INFORMATION BROADCASTING SCHEME IN INFORMATION-SYSTEMS

In this paper, dynamic cryptographic key assignment and information broadcasting schemes based on the RSA public key strategy are proposed. With the cryptographic key generation in a hierarchy, all users are classified into disjoint sets of security classes which employ the relation of partial ordering. In comparison with the existing assignment schemes, whenever a new security class is appended into the user hierarchy system, the corresponding keys can be determined without changing any existing keys. On the other hand, with information broadcasting, the sender broadcasts an encrypted message onto the networking system so that only the legitimate recipients can decrypt it. Compared with the existing broadcasting schemes, our scheme always requires fewer broadcast messages. Furthermore, when a new user is inserted into the distributed system, the corresponding secret and public keys can be determined without changing any existing keys. Therefore, our scheme is suitable for practical implementation.