Cryptographic implementation of a tree hierarchy for access control
Information Processing Letters
Cryptanalysis of YCN key assignment scheme in a hierarchy
Information Processing Letters
Cryptographic solution to a problem of access control in a hierarchy
ACM Transactions on Computer Systems (TOCS)
A method for obtaining digital signatures and public-key cryptosystems
Communications of the ACM
A new key assignment scheme for enforcing complicated access control policies in hierarchy
Future Generation Computer Systems - Selected papers from CCGRID 2002
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This paper presents a modified YCN cryptographic key assignment scheme in a hierarchy with exceptions which is secure against Hwang's attack.