TY - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) A1 - T1 - Cryptanalysis and improvement of two kind of certificateless aggregate signature schemes Y1 - 2016-07-20 JF - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO - JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) SP - 107 EP - 114 VL - 51 IS - 7 UR - http://lxbwk.njournal.sdu.edu.cn N1 - 10.6040/j.issn.1671-9352.0.2016.026 ER -