TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - Ying LI,Jun HU T1 - Hierarchical trusted cryptography service framework based on distributed message drive Y1 - 2020-03-20 JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 19 EP - 27 VL - 55 IS - 3 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.2.2019.205 ER -