13,603 research outputs found
Component Substitution through Dynamic Reconfigurations
Component substitution has numerous practical applications and constitutes an
active research topic. This paper proposes to enrich an existing
component-based framework--a model with dynamic reconfigurations making the
system evolve--with a new reconfiguration operation which "substitutes"
components by other components, and to study its impact on sequences of dynamic
reconfigurations.
Firstly, we define substitutability constraints which ensure the component
encapsulation while performing reconfigurations by component substitutions.
Then, we integrate them into a substitutability-based simulation to take these
substituting reconfigurations into account on sequences of dynamic
reconfigurations. Thirdly, as this new relation being in general undecidable
for infinite-state systems, we propose a semi-algorithm to check it on the fly.
Finally, we report on experimentations using the B tools to show the
feasibility of the developed approach, and to illustrate the paper's proposals
on an example of the HTTP server.Comment: In Proceedings FESCA 2014, arXiv:1404.043
A secure archive for Voice-over-IP conversations
An efficient archive securing the integrity of VoIP-based two-party
conversations is presented. The solution is based on chains of hashes and
continuously chained electronic signatures. Security is concentrated in a
single, efficient component, allowing for a detailed analysis.Comment: 9 pages, 2 figures. (C) ACM, (2006). This is the author's version of
the work. It is posted here by permission of ACM for your personal use. Not
for redistribution. The definitive version was published in Proceedings of
VSW06, June, 2006, Berlin, German
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A UML-based static verification framework for security
Secure software engineering is a new research area that has been proposed to address security issues during the development of software systems. This new area of research advocates that security characteristics should be considered from the early stages of the software development life cycle and should not be added as another layer in the system on an ad-hoc basis after the system is built. In this paper, we describe a UML-based Static Verification Framework (USVF) to support the design and verification of secure software systems in early stages of the software development life-cycle taking into consideration security and general requirements of the software system. USVF performs static verification on UML models consisting of UML class and state machine diagrams extended by an action language. We present an operational semantics of UML models, define a property specification language designed to reason about temporal and general properties of UML state machines using the semantic domains of the former, and implement the model checking process by translating models and properties into Promela, the input language of the SPIN model checker. We show that the methodology can be applied to the verification of security properties by representing the main aspects of security, namely availability, integrity and confidentiality, in the USVF property specification language
Keeping Context In Mind: Automating Mobile App Access Control with User Interface Inspection
Recent studies observe that app foreground is the most striking component
that influences the access control decisions in mobile platform, as users tend
to deny permission requests lacking visible evidence. However, none of the
existing permission models provides a systematic approach that can
automatically answer the question: Is the resource access indicated by app
foreground? In this work, we present the design, implementation, and evaluation
of COSMOS, a context-aware mediation system that bridges the semantic gap
between foreground interaction and background access, in order to protect
system integrity and user privacy. Specifically, COSMOS learns from a large set
of apps with similar functionalities and user interfaces to construct generic
models that detect the outliers at runtime. It can be further customized to
satisfy specific user privacy preference by continuously evolving with user
decisions. Experiments show that COSMOS achieves both high precision and high
recall in detecting malicious requests. We also demonstrate the effectiveness
of COSMOS in capturing specific user preferences using the decisions collected
from 24 users and illustrate that COSMOS can be easily deployed on smartphones
as a real-time guard with a very low performance overhead.Comment: Accepted for publication in IEEE INFOCOM'201
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