Geng Wang Zhen Liu 0008 Dawu Gu Ciphertext Policy Attribute-Based Encryption for Circuits from LWE Assumption. 378-396 2019 ICICS https://doi.org/10.1007/978-3-030-41579-2_22 conf/icics/2019 db/conf/icics/icics2019.html#WangLG19