3,560 research outputs found
Hash-Tree Anti-Tampering Schemes
Procedures that provide detection, location and correction of tampering in documents are known as anti-tampering schemes. In this paper we describe how to construct an anti-tampering scheme using a pre-computed tree of hashes. The main problems of constructing such a scheme are its computational feasibility and its candidate reduction process. We show how to solve both problems by the use of secondary hashing over a tree structure. Finally, we give brief comments on our ongoing work in this area
Robust Watermarking using Hidden Markov Models
Software piracy is the unauthorized copying or distribution of software. It is a growing problem that results in annual losses in the billions of dollars. Prevention is a difficult problem since digital documents are easy to copy and distribute. Watermarking is a possible defense against software piracy. A software watermark consists of information embedded in the software, which allows it to be identified. A watermark can act as a deterrent to unauthorized copying, since it can be used to provide evidence for legal action against those responsible for piracy.In this project, we present a novel software watermarking scheme that is inspired by the success of previous research focused on detecting metamorphic viruses. We use a trained hidden Markov model (HMM) to detect a specific copy of software. We give experimental results that show our scheme is robust. That is, we can identify the original software even after it has been extensively modified, as might occur as part of an attack on the watermarking scheme
Tampering in RFID: A Survey on Risks and Defenses
RFID is a well-known pervasive technology, which provides promising opportunities
for the implementation of new services and for the improvement of traditional
ones. However, pervasive environments require strong efforts on all the aspects
of information security. Notably, RFID passive tags are exposed to attacks, since strict
limitations affect the security techniques for this technology. A critical threat for RFIDbased
information systems is represented by data tampering, which corresponds to the
malicious alteration of data recorded in the tag memory. The aim of this paper is to describe
the characteristics and the effects of data tampering in RFID-based information
systems, and to survey the approaches proposed by the research community to protect
against it. The most important recent studies on privacy and security for RFID-based
systems are examined, and the protection given against tampering is evaluated. This
paper provides readers with an exhaustive overview on risks and defenses against data
tampering, highlighting RFID weak spots and open issues
Hash-Tree Anti-Tampering Schemes
Procedures that provide detection, location and correction of tampering in documents are known as anti-tampering schemes. In this paper we describe how to construct an anti-tampering scheme using a pre-computed tree of hashes. The main problems of constructing such a scheme are its computational feasibility and its candidate reduction process. We show how to solve both problems by the use of secondary hashing over a tree structure. Finally, we give brief comments on our ongoing work in this area
The Most Common Characteristics of Fragile Video Watermarking: A Review
The progress of network and multimedia technologies has been phenomenal during the previous two decades. Unauthorized users will be able to copy, retransmit, modify reproduction, and upload the contents more easily as a result of this innovation. Malicious attackers are quite concerned about the development and widespread use of digital video. Digital watermarking technology gives solutions to the aforementioned problems. Watermarking methods can alleviate these issues by embedding a secret watermark in the original host data, allowing the genuine user or file owner to identify any manipulation. In this study, lots of papers have been analyzed and studied carefully, in the period 2011ā2022. The historical basis of the subject should not be forgotten so studying old research will give a clear idea of the topic. To aid future researchers in this subject, we give a review of fragile watermarking approaches and some related papers presented in recent years. This paper presents a comparison of many relevant works in this field based on some of the outcomes and improvements gained in these studies, which focuses on the common characteristics that increase the effect of watermarking techniques such as invisibility, tamper detection, recovery, and security
 
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