An Optimal Algorithm for Assigning Cryptographic Keys to Control Access in a Hierarchy
IEEE Transactions on Computers
Cryptographic implementation of a tree hierarchy for access control
Information Processing Letters
A cryptographic key generation scheme for multilevel data security
Computers and Security
Cryptographic solution to a problem of access control in a hierarchy
ACM Transactions on Computer Systems (TOCS)
Handbook of Applied Cryptography
Handbook of Applied Cryptography
A Time-Bound Cryptographic Key Assignment Scheme for Access Control in a Hierarchy
IEEE Transactions on Knowledge and Data Engineering
Security of Tzeng's Time-Bound Key Assignment Scheme for Access Control in a Hierarchy
IEEE Transactions on Knowledge and Data Engineering
Efficient Time-Bound Hierarchical Key Assignment Scheme
IEEE Transactions on Knowledge and Data Engineering
Cryptographic key assignment schemes for any access control policy
Information Processing Letters
Research: Dynamic key management schemes for access control in a hierarchy
Computer Communications
A cryptographic key assignment scheme in a hierarchy for access control
Mathematical and Computer Modelling: An International Journal
Provably-secure time-bound hierarchical key assignment schemes
Proceedings of the 13th ACM conference on Computer and communications security
A novel key agreement protocol based on chaotic maps
Information Sciences: an International Journal
Efficient techniques for realizing geo-spatial access control
ASIACCS '07 Proceedings of the 2nd ACM symposium on Information, computer and communications security
New constructions for provably-secure time-bound hierarchical key assignment schemes
Proceedings of the 12th ACM symposium on Access control models and technologies
Access control in user hierarchy based on elliptic curve cryptosystem
Information Sciences: an International Journal
Fast S-box security mechanism research based on the polymorphic cipher
Information Sciences: an International Journal
New constructions for provably-secure time-bound hierarchical key assignment schemes
Theoretical Computer Science
Tools protecting stakeholders against hackers and crackers: an insight review
International Journal of Electronic Security and Digital Forensics
Information Sciences: an International Journal
An efficient key assignment scheme for access control in a large leaf class hierarchy
Information Sciences: an International Journal
GPC'10 Proceedings of the 5th international conference on Advances in Grid and Pervasive Computing
Incorporating temporal capabilities in existing key management schemes
ESORICS'07 Proceedings of the 12th European conference on Research in Computer Security
A note on time-bound hierarchical key assignment schemes
Information Processing Letters
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A time-bound hierarchical key assignment scheme is a method to assign a cryptographic key to each class of users in a system organized as a partially ordered hierarchy, in such a way that key derivation is constrained both by class relationships and by time. Recently, a time-bound hierarchical key assignment scheme based on tamper-resistant devices and requiring low computational load and implementation cost has been proposed. Unfortunately, the scheme is not secure. In this paper we show how three malicious users can handle public and private information to misuse their tamper-resistant devices in order to compute some encryption keys that they should not be able to learn. We also show some countermeasures to withstand the weakness we have exploited.