You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Survey on Revocation in Ciphertext-Policy Attribute-Based Encryption 
Chapter Title:  The Multiauthority Attribute Based Access Control System 
1. Abstract of Cited Paper (BIB001):  Decentralizing multi-authority attribute-based encryption (ABE) has been adopted for solving problems arising from sharing confidential corporate data in cloud computing. For decentralizing multi-authority ABE systems that do not rely on a central authority, collusion resistance can be achieved using a global identifier. Therefore, identity needs to be managed globally, which results in the crucial problems of privacy and security. A scheme is developed that does not use a central authority to manage users and keys, and only simple trust relations need to be formed by sharing the public key between each attribute authority (AA). User identities are unique by combining a user’s identity with the identity of the AA where the user is located. Once a key request needs to be made to an authority outside the domain, the request needs to be performed by the authority in the current domain rather than by the users, so, user identities remain private to the AA outside the domain, which will enhance privacy and security. In addition, the key issuing protocol between AA is simple as the result of the trust relationship of AA. Moreover, extensibility for authorities is also supported by the scheme presented in this paper. The scheme is based on composite order bilinear groups. A proof of security is presented that uses the dual system encryption methodology.

Literature Review:
To tackle the single authority schemes' problems, an effective way is to minimize the trust level of the single authority, strengthen the privacy of user data, and enhance the system security and performance by replacing the single authority with multiple ones for disjoint attribute management, which becomes much harder for an adversary to compromise. Therefore, in this section, the type of scheme that allows securely storing data on a public cloud storage system and employs multiple authorities to manage sets of attributes, is presented. A critical challenge of current multiauthority access control systems (also all single authority schemes) is the inefficiency of the key generation process. This issue occurs in the single authority systems when one authority manages all attributes in a system and issues secret keys for all system users. Therefore, compromising or crashing this authority makes the whole system unavailable. The same issue happens in multiple authorities schemes, when each authority in the system administrates a disjoint attribute set (i.e., each authority administrates a different set of attributes), which presents a performance bottleneck. To mitigate the effects of this issue, all attribute sets ought to be managed by all system attribute authorities individually. Although many recent multiauthority CP-ABE schemes have been proposed  BIB002 , some limitations are still not considered. The existing multiauthority access control systems can be classified into three categories with their limitations summarized below. • The first type of scheme (e.g., a scheme by Han et al. BIB001 ) contains many authorities that have to work together, resulting in a high communication cost and lack of scalability since it is hard for authorities to join or leave freely. Furthermore, these authorities might collude with each other and combine their information to gain unauthorized data about the users.