Performing secure and robust embedding and extracting in real time voice streams without deteriorating the voice quality is a great challenge. This paper aims on hiding the secret data bits in the voice packets without modifying any data in the cover thereby improving the embedding transparency and becomes robust against the steganalysis attacks using coverless approach. Initially a hash array is built with the frame size. The cover bit position is identified from the hashing function. The hash array is marked with a flag value to indicate that the particular sample consist of the secret message bit. The hash array is attached with the VoIP samples, at the receiver side the hash table is separated, and the secret bits are extracted based on the hash array. The experimental results conducted on a VoIP prototype proved to be simpler and effective in terms of the computational complexity, undetectability and voice quality at both sender and receiver end.
It this paper it is proposed a new access control model – Hybrid Role and Attribute Based Access Control (HRABAC). It is an extension of Role-Based Access Control (RBAC). HRABAC is designed for information systems and enterprise software and combines the advantages of RBAC and Attribute-Based Access Control (ABAC). HRABAC is easy configurable, fine-grained and supports role hierarchies. The proposed model HRABAC describes the access control scheme in Laravel package laravelroles/rolespermissions, which is developed by the author of the paper, as an answer to the requirements of practice of fine-grained and easy configurable access control solution. Laravel is chosen, because it is the most popular and the most widely used PHP framework. The package laravelroles/rolespermissions is developed on Laravel so that maximum number of programmers could use it. This package contains working and tested functionalities for managing users, roles and permissions, and it is applied in accounting information system.
Access control is a part of the security of information technologies. Access control regulates the access requests to system resources. The access control logic is formalized in models. Many access control models exist. They vary in their design, components, policies and areas of application. With the developing of information technologies, more complex access control models have been created. This paper is concerned with overview and analysis for a number of access control models. First, an overview of access control models is presented. Second, they are analyzed and compared by a number of parameters: storing the identity of the user, delegation of trust, fine-grained policies, flexibility, object-versioning, scalability, using time in policies, structure, trustworthiness, workflow control, areas of application etc. Some of these parameters describe the access control models, while other parameters are important characteristics and components of these models. The results of the comparative analysis are presented in tables. Prospects of development of new models are specified.
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