New PDF release: Image and Video Encryption: From Digital Rights Management

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Extra info for Image and Video Encryption: From Digital Rights Management to Secured Personal Communication

Example text

The so called naive method - the most secure one - is to take the multimedia bitstream and encrypt this stream with the aid of a cryptographically strong cipher like AES. Here, the encryption is performed after the compression stage and due to the complexity of the involved encryption algorithm, such a scheme inherently adds significant latency which often conflicts with real-time constraints. Since runtime performance is often very critical in video encoding and decoding, more efficient methods have been proposed.

3. Block Ciphers Secret-key ciphers can be partitioned into two groups: block ciphers and stream ciphers. The unit of operation is a block of data, its size depends on the actual cipher, common values are 64 and 128 bits of data, sometimes larger, older ciphers use smaller blocks, whereas modern ciphers prefer larger block sizes. Block ciphers process one block of input data, transform it to another block of output data (based on some key) of the same size, then proceed to the next block. Stream ciphers operate on a continuous stream of undetermined size, some ciphers process the data bit after bit, other ciphers process the data byte-wise.

Eve is an evil eavesdropper who engages just in passive means to illegitimately acquire some information. Mallory is her malicious counterpart who actively inserts or modifies data on the way between Alice and Bob. Trent is a person who is trusted by all involved parties. In some occasions more people are required, according to Schneier [131] the warden Walter, the prover Peggy and the verifier Victor. 2. Secret key vs. Public key Cryptography Modern cryptography gives us two classes of encryption methods: symmetric ciphers: the family of secret-key cryptography.

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