Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Roman Rykaczewski"


  The proposed method is a new Joint Fingerprinting and Decryption (JFD) method that uses a cipher based on quaternion rotation to encrypt color images that are then sent to all users via multicast transmission. Individual decryption keys depend on the users’ fingerprints, so that a unique fingerprint is introduced into the image during decryption for each decryption key. A simulation-based research was conducted to examine the method’s robustness against collusion attacks. 1. INTRODUCTION This paper addresses the problem of unauthorized redistribution of multimedia content by malicious users (pirates). There are two ways to protect distributed multimedia: encryption and digital fingerprinting [1]. The goal of encryption is to ensure that only authorized users with proper decryption keys are able to use distributed multimedia. However, after decryption the data loses its protection and may be illegally redistributed by malicious users. In order to maintain security after decryption it is necessary to use a digital fingerprint. Digital fingerprinting is a data hiding technique in which data is protected by unique sequences, called fingerprints. Each fingerprint identifies an individual user and is embedded in the image in such a way that it is imperceptible to the human eye. If a pirate redistributes his or her copy, the analysis of the embedded fingerprint should allow to identify the pirate. Joint Fingerprinting and Decryption (JFD) [2,3,4,5] methods combine encryption and fingerprinting through embedding fingerprints during decryption process. The distribution side encrypts multimedia by using the encryption key and then sends the encrypted data via multicast transmission. Each user has a unique decryption key which is different from the encryption key and introduces some minor changes into decrypted images. These changes are imperceptible to the human eye and are unique for each user, hence they are the us[...]

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