From the Publisher: 
The accessible presentation of this book gives both a general view of the entire computer vision enterprise and also offers sufficient detail to be able to build useful applications. Users learn techniques that have proven to be useful by first-hand experience and a wide range of mathematical methods. A CD-ROM with every copy of the text contains source code for programming practice, color images, and illustrative movies. Comprehensive and up-to-date, this book includes essential topics that either reflect practical significance or are of theoretical importance. Topics are discussed in substantial and increasing depth. Application surveys describe numerous important application areas such as image based rendering and digital libraries. Many important algorithms broken down and illustrated in pseudo code. Appropriate for use by engineers as a comprehensive reference to the computer vision enterprise.

Computer vision : a modern approach = 计算机视觉 : 一种现代的方法

The objective of this paper is to give a comprehensive introduction to applied cryptography with an engineer or computer scientist in mind. The emphasis is on the knowledge needed to create practical systems which supports integrity, confidentiality, or authenticity. Topics covered includes an introduction to the concepts in cryptography, attacks against cryptographic systems, key use and handling, random bit generation, encryption modes, and message authentication codes. Recommendations on algorithms and further reading is given in the end of the paper. This paper should make the reader able to build, understand and evaluate system descriptions and designs based on the cryptographic components described in the paper.

[서평]「Applied Cryptography」

Providing accurate and opportune information on people's activities and behaviors is one of the most important tasks in pervasive computing. Innumerable applications can be visualized, for instance, in medical, security, entertainment, and tactical scenarios. Despite human activity recognition (HAR) being an active field for more than a decade, there are still key aspects that, if addressed, would constitute a significant turn in the way people interact with mobile devices. This paper surveys the state of the art in HAR based on wearable sensors. A general architecture is first presented along with a description of the main components of any HAR system. We also propose a two-level taxonomy in accordance to the learning approach (either supervised or semi-supervised) and the response time (either offline or online). Then, the principal issues and challenges are discussed, as well as the main solutions to each one of them. Twenty eight systems are qualitatively evaluated in terms of recognition performance, energy consumption, obtrusiveness, and flexibility, among others. Finally, we present some open problems and ideas that, due to their high relevance, should be addressed in future research.

A Survey on Human Activity Recognition using Wearable Sensors

Wireless sensor networks (WSN) are typically deployed in an unattended environment, where the legitimate users can login to the network and access data as and when demanded. Consequently, user authentication is a primary concern in this resource-constrained environment before accessing data from the sensor/gateway nodes. In this letter, we present a two-factor user authentication protocol for WSN, which provides strong authentication, session key establishment, and achieves efficiency.

Two-factor user authentication in wireless sensor networks

By broadcasting messages about traffic status to vehicles wirelessly, a vehicular ad hoc network (VANET) can improve traffic safety and efficiency. To guarantee secure communication in VANETs, security and privacy issues must be addressed before their deployment. The conditional privacy-preserving authentication (CPPA) scheme is suitable for solving security and privacy-preserving problems in VANETs, because it supports both mutual authentication and privacy protection simultaneously. Many identity-based CPPA schemes for VANETs using bilinear pairings have been proposed over the last few years to enhance security or to improve performance. However, it is well known that the bilinear pairing operation is one of the most complex operations in modern cryptography. To achieve better performance and reduce computational complexity of information processing in VANET, the design of a CPPA scheme for the VANET environment that does not use bilinear paring becomes a challenge. To address this challenge, we propose a CPPA scheme for VANETs that does not use bilinear paring and we demonstrate that it could supports both the mutual authentication and the privacy protection simultaneously. Our proposed CPPA scheme retains most of the benefits obtained with the previously proposed CPPA schemes. Moreover, the proposed CPPA scheme yields a better performance in terms of computation cost and communication cost making it be suitable for use by the VANET safety-related applications.

An Efficient Identity-Based Conditional Privacy-Preserving Authentication Scheme for Vehicular Ad Hoc Networks

Firewalls typically filter network traffic at several different layers. At application layer, filtering is based on various security relevant information encapsulated into protocol messages. The major obstacle for efficient verification of authenticity of messages at application layer is the difficulty of verifying digital signatures without disclosure of content protected by encryption. This is due to a traditional paradigm of generating a digital signature of a message and then encrypting the signature together with the message to preserve confidentiality, integrity, non-repudiation and authenticity. To overcome this limitation, a scheme shall be proposed for enabling signature verification without disclosing the content of messages. To provide maximum efficiency, the scheme is based on digital signcryption.

Encrypted Message Authentication by Firewalls

Sensor networks pose unique technical and logistical challenges. One of the most widely cited applications for sensor networks is monitoring national borders for humans attempting to surreptitiously cross on foot, especially at night. Other suggested applications of sensor networks include battlefield observation and forest fire detection

Taking Sensor Networks from the Lab to the Jungle

There are many applications in which it is necessary to transmit authenticatable messages while achieving certain privacy goals such as signer ambiguity The emerging area of vehicular ad-hoc network is a good example application domain with this requirement The ring signature technique that uses an ad-hoc group of signer identities is a widely used method for generating this type of privacy preserving digital signatures The identity-based cryptographic techniques do not require certificates The construction of ring signatures using identity-based cryptography allow for privacy preserving digital signatures to be created in application when certificates are not readily available or desirable such as in vehicle area networks We propose a new designated verifier identity-based ring signature scheme that is secure against full key exposure attacks even for a small group size This is a general purpose primitive that can be used in many application domains such as ubiquitous computing where signer ambiguity is required in small groups We consider the usefulness of identity-based cryptographic primitives in vehicular ad-hoc networks and use a specific example application to illustrate the use of identity-based ring signatures as a tool to create privacy preserving authenticatable messages

An Identity-based Ring Signature Scheme with Enhanced Privacy

Previous proxy signature schemes enable a principal to have a trusted proxy agent sign messages on its behalf. We present a proxy signature scheme that combines the functionality of proxy signing and en-cryption. This proxy-signcryption scheme is useful for applications that are based on unreliable datagram style network communication model where messages are individually signed and not serially linked via a session key to provide authenticity and integrity. Use of a proxy agent to perform signature function is desirable for applications that are expected to support computing devices with low computational power and storage capacities. Integration of encryption functionality to provide secrecy at no additional cost to the proxy signature generation is an eecient means by which to support the class of applications targeted by this research work such as e-commerce using mobile computing and communication devices.

An Efficient Scheme for Secure Message Transmission Using Proxy-Signcryption

Traditionally, the process of online digital content distribution has involved a limited number of centralised distributors selling protected contents and licenses authorising the use of these contents, to consumers. In this paper, we extend this model by introducing a security scheme that enables DRM preserving digital content redistribution. Essentially consumers can not only buy the rights to use digital content but also the rights to redistribute it to other consumers in a DRM controlled fashion. We examine the threats associated with such a redistribution model and explain how our scheme addresses them.

Chandana Gamage

Papers

Encrypted Message Authentication by Firewalls

Taking Sensor Networks from the Lab to the Jungle

An Identity-based Ring Signature Scheme with Enhanced Privacy

An Efficient Scheme for Secure Message Transmission Using Proxy-Signcryption

Enabling DRM-preserving digital content redistribution