CP-ABE Scheme Satisfying Constant-size Keys based on ECC

Cloud-based applications, especially on IoT devices, is one of the desired fields to apply Ciphertext-Policy Attribute-Based Encryption (CP-ABE). Most of the IoT devices are with the low-end configuration; hence, they need better time and computation efficient algorithms. There are existing algorithms, but none of the systems are based on conventional cryptosystems as well as secure at the same time. Here, we propose a CP-ABE scheme based on the elliptic curve cryptosystem with a constant-size secret key, which is capable of addressing the collusion attack security issue.