Watermarking protocol of secure verification

The secure verification is important for watermarking protocols. A malicious arbitrator is able to remove an original watermark from an unauthorized copy of the digital content as a result of a security breach in the phase of arbitration and resell multiple copies of it with impunity. We propose a novel buyer-seller watermarking protocol of secure verification. In this scheme, a seller permutes an original watermark provided by a trusted Watermarking Certification Authority (WCA) and embeds it into digital content in an encrypted domain. In case an unauthorized copy is found, the seller can recover the original watermark from the watermark extracted from the copy and sends it to an arbitrator. Without the knowledge of permutations applied by the seller, the arbitrator is unable to remove the permuted watermark from the digital content. Hence, verification is secured. As an additional advantage of the proposed protocol, arbitration can be conducted without the need for the cooperation of the WCA or the buyer

Improved Hybrid Fingerprint-Based P2P Media Distribution For Privacy Protection

It has been suggested that anonymous fingerprinting could be an easy way to ensure the lawful dissemination of copyright-protected multimedia content without compromising the privacy of customers, whose names would only be revealed in the event of illegal re-distribution of the content. This idea has been put forward as a potential solution to the problem. However, the majority of the currently available anonymous fingerprinting systems are not practical. This is due to the fact that they make use of complicated protocols that take up a lot of time, as well as homomorphic encryption of the data. Furthermore, they distribute the data using a unicast approach, which does not scale well for a large number of clients. The concept of recombined fingerprints serves as the foundation for this body of work, which also makes an effort to overcome some of these restrictions. On the other hand, recommended fingerprint approaches need a complex graph search for traitor monitoring, which in turn demands the participation of additional buyers and honest proxies in their P2P distribution scenario. Getting rid of these issues and developing a fingerprinting system that is not only efficient but also scalable, private, and makes use of P2P technology is the purpose of this research

Secure buyer - seller watermarking protocol

In the existing watermarking protocols, a trusted third party (TTP) is introduced to guarantee that a protocol is fair to both the seller and buyer in a digital content transaction. However, the TTP decreases the security and affects the protocol implementation. To address this issue, in this article a secure buyer&ndash;seller watermarking protocol without the assistance of a TTP is proposed in which there are only two participants, a seller and a buyer. Based on the idea of sharing a secret, a watermark embedded in digital content to trace piracy is composed of two pieces of secret information, one produced by the seller and one by the buyer. Since neither knows the exact watermark, the buyer cannot remove the watermark from watermarked digital content, and at the same time the seller cannot fabricate piracy to frame an innocent buyer. In other words, the proposed protocol can trace piracy and protect the customer&rsquo;s rights. In addition, because no third party is introduced into the proposed protocol, the problem of a seller (or a buyer) colluding with a third party to cheat the buyer (or the seller), namely, the conspiracy problem, can be avoided.<br /

An enhanced watermarking protocol for electronic copyright management

In Piva et al\u27s watermarking scheme for electronic copyright management system (ECMS), authors were considered trusted potentially, so a dishonest author could authorize more than one distributor to sell her one document, named &quot;One Document to Multi-distributor&quot; problem, which would damage the benefit of the distributors. To resolve the problem, in this paper, we propose an enhanced watermarking protocol based on Piva et al\u27s scheme by introducing document nature code (DNC) and register records table. In addition, our protocol offers the distributor an efficient means to verify his right to an authorized digital document.<br /

Analysis of a buyer-seller watermarking protocol for trustworthy purchasing of digital contents

In ubiquitous environments where human users get to access diverse kinds of (often multimedia enabled) services irrespective of where they are, the issue of security is a major concern. Security in this setting encompasses both in the interest of the human users as well as their information and objects that they own. A typical kind of transaction interaction among users and/or machines in these environments is that of exchanging digital objects via purchases and/or ownership transfers, e.g. someone buying a song from iTunes via his iPhone, or downloading either bought or rented movies onto a portable DVD player. Here, there is a need to provide trustworthy protection of the rights of both parties; i.e. the seller’s copyright needs to be protected against piracy, while on the other hand it has been highlighted in literature the need to protect innocent buyers from being framed. Indeed, if either party cannot be assured that his rights are protected when he is involved in transactions within such environments, he would shy away and instead prefer for instance the more conventional non-digital means of buying and selling. And therefore without active participation from human users and object owners it is difficult to fully kick off the actual realization of intelligent environments. Zhang et al. recently proposed a buyer–seller watermarking protocol without a trusted third party based on secret sharing. While it is a nice idea to eliminate the need of a trusted third party by distributing secret shares between the buyer and the seller such that neither party has knowledge of the fingerprint embedded in a content, we show that it is possible for a buyer to remove his part of the fingerprint from the content he bought. This directly disproves the piracy tracing property claimed by the protocol. In fact, since piracy tracing is one of the earliest security applications of watermarking schemes, it raises doubts as to the soundness of the design of this protocol

A Lightweight Privacy Preserved Buyer Seller Watermarking Protocol Based on Priced Oblivious Transfer

replacing traditional selling of digital products (such as songs, videos,movies, software, books, documents, images, etc.) through shops. This mode of sale can bring the product price down as infrastructure cost in setting up shops and retail chain is reduced. On downside, however, this may increase problem of piracy as digital data can be easily copied, manipulated and transmitted. To protect copyright of owner, establish right of buyer on purchased copy and yet check data piracy, it is required that a rusted e-distribution system be built. Such a system should be able to ensure secure transaction between buyer and seller, check ownership and track the origin of unauthorized copies..The buyer seller watermarking protocols are heavyweight protocols.These protocols require large computation power and network bandwidth.The heavyweight protocols could not be used for the resource constrained devices since the devices does not support battery power.A lightweight protocol has been proposed which is best suited for the resource constrained devices. The protocol is based on a fast asymmetric encryption with novel simplification.In this approach the seller authenticates the buyer but does not learn which items are purchased. The protocol is designed in such a way that the buyers pay the right price without disclosing the purchased item, and the sellers are able to identify buyers that released pirated copies. The protocol is constructed based on the priced oblivious transfer and the existing techniques for asymmetric watermark embedding. Index Terms- Buyer–seller watermarking protocol, fair exchange, priced oblivious transfer (POT). B I

A New Joint Fingerprinting and Decryption Scheme based on a Lattice Problem

We propose a new encryption scheme that supports joint fingerprinting and decryption. The scheme is remarkably resistant to known-plaintext attack and collusion attack (e.g. average attack or other linear combination attack) on keys. Interestingly, the security of our scheme is relied on a lattice problem: Given a collection of random lattice points generated from a short basis of a lattice, find the short basis. The scheme can be used as a traitor-tracing scheme or a buyer-seller watermarking scheme

(In)Security of an Efficient Fingerprinting Scheme with Symmetric and Commutative Encryption of IWDW 2005

We analyze the security of a fingerprinting scheme proposed at IWDW 2005. We show two results, namely that this scheme (1) does riot provide seller security: a dishonest buyer can repudiate the fact that, he redistributed a content, and (2) does riot, provide buyer security: a buyer can be framed by a malicious seller

On the Implementation of Spread Spectrum Fingerprinting in Asymmetric Cryptographic Protocol

<p/> <p>Digital fingerprinting of multimedia contents involves the generation of a fingerprint, the embedding operation, and the realization of traceability from redistributed contents. Considering a buyer's right, the asymmetric property in the transaction between a buyer and a seller must be achieved using a cryptographic protocol. In the conventional schemes, the implementation of a watermarking algorithm into the cryptographic protocol is not deeply discussed. In this paper, we propose the method for implementing the spread spectrum watermarking technique in the fingerprinting protocol based on the homomorphic encryption scheme. We first develop a rounding operation which converts real values into integer and its compensation, and then explore the tradeoff between the robustness and communication overhead. Experimental results show that our system can simulate Cox's spread spectrum watermarking method into asymmetric fingerprinting protocol.</p