A key-lock-pair oriented access control scheme for the growth of users and files

Cryptanalyses and improvements of two cr

Cryptanalyses and improvements of two cryptographic key assignment schemes for dynamic access control in a user hierarchy

✍ Chien-Lung Hsu; Tzong-Sun Wu 📂 Article 📅 2003 🏛 Elsevier Science 🌐 English ⚖ 152 KB

## Recently, Wu and Chang and Shen and Chen separately proposed a cryptographic key assignment scheme for solving access control problem in a partially ordered user hierarchy. However, this paper will show the security leaks inherent in both schemes based on polynomial interpolations. That is, the u