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Vector databases increasingly enforce role-based access control, where each top-k approximate nearest neighbor query must return only vectors the querying role is authorized to access. Two extremes bracket the design space. A single global…

Databases · Computer Science 2026-05-14 Shanshan Han , Vishal Chakraborty , Sharad Mehrotra

Role-Based Access Control (RBAC) struggles to adapt to dynamic enterprise environments with documents that contain information that cannot be disclosed to specific user groups. As these documents are used by LLM-driven systems (e.g., in…

Cryptography and Security · Computer Science 2025-12-24 Michele Lorenzo , Idilio Drago , Dario Salvadori , Fabio Romolo Vayr

Access control policies are used to restrict access to sensitive records for authorized users only. One approach for specifying policies is using role based access control (RBAC) where authorization is given to roles instead of users. Users…

Cryptography and Security · Computer Science 2015-03-27 Khair Eddin Sabri

Basic role based access control [RBAC] provides a mechanism for segregating access privileges based upon a user's hierarchical roles within an organization. This model doesn't scale well when there is tight integration of multiple…

Cryptography and Security · Computer Science 2007-05-23 Jonathan K. Adams , Basheer N. Bristow

Attribute-based encryption (ABE) is a promising cryptographic mechanism for providing confidentiality and fine-grained access control in the cloud-based area. However, due to high computational overhead, common ABE schemes are not suitable…

Cryptography and Security · Computer Science 2021-07-22 Mostafa Chegenizadeh , Mohammad Ali , Javad Mohajeri , Mohammad Reza Aref

Cloud Computing is a set of IT Services that are provided to a customer over a network and these services are delivered by third party provider who owns the infrastructure and reduce the burden at user's end. Nowadays researchers devoted…

Distributed, Parallel, and Cluster Computing · Computer Science 2013-08-26 Gitanjali , Sukhjit Singh Sehra , Jaiteg Singh

Relationship-based access control (ReBAC) provides a high level of expressiveness and flexibility that promotes security and information sharing. We formulate ReBAC as an object-oriented extension of attribute-based access control (ABAC) in…

Cryptography and Security · Computer Science 2018-08-23 Thang Bui , Scott D. Stoller , Jiajie Li

In large databases, creating user interface for browsing or performing insertion, deletion or modification of data is very costly in terms of programming. In addition, each modification of an access control policy causes many potential and…

Cryptography and Security · Computer Science 2015-06-01 Kambiz Ghazinour , Mehdi Ghayoumi

Role mining tackles the problem of finding a role-based access control (RBAC) configuration, given an access-control matrix assigning users to access permissions as input. Most role mining approaches work by constructing a large set of…

Cryptography and Security · Computer Science 2013-01-08 Mario Frank , Joachim M. Buhmann , David Basin

The rapid growth of machine learning capabilities and the adoption of data processing methods using vector embeddings sparked a great interest in creating systems for vector data management. While the predominant approach of vector data…

Databases · Computer Science 2024-03-26 Viktor Sanca , Anastasia Ailamaki

Non-volatile memory (NVM) is a class of promising scalable memory technologies that can potentially offer higher capacity than DRAM at the same cost point. Unfortunately, the access latency and energy of NVM is often higher than those of…

Hardware Architecture · Computer Science 2018-05-01 HanBin Yoon , Justin Meza , Rachata Ausavarungnirun , Rachael A. Harding , Onur Mutlu

Hierarchical VAEs have emerged in recent years as a reliable option for maximum likelihood estimation. However, instability issues and demanding computational requirements have hindered research progress in the area. We present simple…

Machine Learning · Computer Science 2022-04-29 Louay Hazami , Rayhane Mama , Ragavan Thurairatnam

The problems which are important for the effective functioning of an access control policy in a large information system (LIS) are selected. The general concept of a local optimization of a role-based access control (RBAC) model is…

Cryptography and Security · Computer Science 2018-12-27 N. F. Bogachenko

Approximate Nearest Neighbor Search (ANNS) is essential for various data-intensive applications, including recommendation systems, image retrieval, and machine learning. Scaling ANNS to handle billions of high-dimensional vectors on a…

Databases · Computer Science 2025-06-18 Qian Xu , Feng Zhang , Chengxi Li , Lei Cao , Zheng Chen , Jidong Zhai , Xiaoyong Du

Proliferation of systems that generate enormous amounts of data and operate in real time has led researchers to rethink the current organization of the cloud. Many proposed solutions consist of a number of small data centers in the vicinity…

Cryptography and Security · Computer Science 2024-10-29 Tamara Ranković , Miloš Simić , Milan Stojkov , Goran Sladić

Modern deep learning models capture the semantics of complex data by transforming them into high-dimensional embedding vectors. Emerging applications, such as retrieval-augmented generation, use approximate nearest neighbor (ANN) search in…

Databases · Computer Science 2025-10-01 Guoyu Hu , Shaofeng Cai , Tien Tuan Anh Dinh , Zhongle Xie , Cong Yue , Gang Chen , Beng Chin Ooi

Relationship-based access control (ReBAC) is a flexible and expressive framework that allows policies to be expressed in terms of chains of relationship between entities as well as attributes of entities. ReBAC policy mining algorithms have…

Cryptography and Security · Computer Science 2019-08-12 Thang Bui , Scott D. Stoller , Hieu Le

Checkpointing large amounts of related data concurrently to stable storage is a common I/O pattern of many HPC applications. However, such a pattern frequently leads to I/O bottlenecks that lead to poor scalability and performance. As…

Distributed, Parallel, and Cluster Computing · Computer Science 2021-03-04 Bogdan Nicolae , Adam Moody , Gregory Kosinovsky , Kathryn Mohror , Franck Cappello

Similarity-based vector search underpins many important applications, but a key challenge is processing massive vector datasets (e.g., in TBs). To reduce costs, some systems utilize SSDs as the primary data storage. They employ a proximity…

Databases · Computer Science 2025-08-22 Peiqi Yin , Xiao Yan , Qihui Zhou , Hui Li , Xiaolu Li , Lin Zhang , Meiling Wang , Xin Yao , James Cheng

The era of big data has promoted the vigorous development of many industries, boosting the full potential of holistic data-driven analysis. Hadoop has become the primary choice for mainstream platforms used by stakeholders to process big…

Cryptography and Security · Computer Science 2020-11-17 Min Yang
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