Contrasting to classical encryption‚ security may not be the most important aim for an encryption system for images and videos. Depending on the type
of application‚ other properties (like speed or bitstream compliance after encryption) might be equally important as well. As an example‚ the terms “soft encryption” or “selective encryption” are sometimes used as opposed to classical “hard” encryption schemes like full AES encryption in this context. Such schemes do not strive for maximum security and trade off security for computational complexity. They are designed to protect multimedia content and fulfil the security requirements for a particular multimedia application. For example‚ real-time encryption for an entire video stream using classical ciphers requires much computation time due to the large amounts of data involved‚ on the other hand many multimedia applications require security on a much lower level (e.g. TV broadcasting) or should protect their data just for a short period of time (e.g. news broadcast). Therefore‚ the search for fast encryption procedures specifically tailored to the target environment is mandatory for multimedia security applications. The fields of interest to deploy such solutions span from digital rights management (DRM) schemes to secured personal communication.
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