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...rmats, such as JPEG, JPEG2000 and H.264. For multimedia formats, format-compliant encryption can offer significant application advantages. Modern compression standards, such as JPEG2000 and H.264:SVC, generate a scalable representation of the visual data, that can be efficiently adapted. The preservation of scalability in the encrypted domain allows to perform adaption in the encrypted domain. The preservation of scalability is of fundamental importance for the secure streaming of multimedia content [6]. There have been numerous proposals for scalability-preserving encryption of JPEG2000 (see [3] for a survey), which has also been standardized within JPEG2000 (JPSEC) [8]. Most of the proposed JPEG2000 encryption schemes encrypt only the coded coefficient data (called bitstream in JPEG2000), while 2 preserving header data. These schemes require encryption schemes which preserve the format of the JPEG2000 bitstream. Our approach is to use the formal description of the JPEG2000 bitstream, i.e, of the regular language describing it, in order to develop a simple yet efficient bitstream-compliant encryption scheme. Thus in this work we focus on efficient encryption of regular languages, and...

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... general and JPEG 2000 in particular have been proposed recently, e.g., [5], [6], [7], [8], [9], [10]. An overview and discussion of the proposed approaches in the context of JPEG2000 can be found in =-=[11]-=-. JPEG 2000 security is discussed in JPEG 2000 Part 8 ([12], [13]). This part has the title “Secure JPEG 2000” and is referred to as JPSEC. It “intends to provide tools and solutions in terms of speci...

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... preservation of scalability is of fundamental importance for the secure streaming of multimedia content [6]. There have been numerous proposals for scalability-preserving encryption of JPEG2000 (see =-=[3]-=- for a survey), which has also been standardized within JPEG2000 (JPSEC) [8]. Most of the proposed JPEG2000 encryption schemes encrypt only the coded coefficient data (called bitstream in JPEG2000), w...