Security analysis of two public key encryption schemes
Lei Xie · Jisuanji yingyong yanjiu · 2015
Broadcast encryption(BE) and attribute-based encryption(ABE) schemes are two kinds of important public key encryption schemes,which can transmit an encrypted message to a lot of users simultaneously,and has significant application in many fields such as Pay-TV,digital copyright management and resource access control and so on.This paper first analyzed an identity-based BE(IBBE) scheme and the result shows that the attacker can compute the private key of any other user if it can obtain the key of one user.It also studied an ABE scheme,and proved that the scheme cannot really hide the access structure and the attacker can get the associated access structure only from a ciphertext.