DVS Clipster Specifications download pdf (Page 38)

6-6

Miscellaneous

6.5 Keys and Certificates Explained

There are various keys and certificates involved in the process of creat-

ing a DCP. This section tries to shed some light on them and the way

they are used.

6.5.1 What’s a Key

A key is a piece of information (normally a string) that determines the

output of a cryptographic algorithm. The key is used during encryption

by the cryptographic algorithm to transform a certain piece of informa-

tion (e.g. plaintext) to ciphertext, i.e. encrypted information. Vice ver-

sa, during decryption the key is used by the algorithm to decode the

ciphertext back to the original information.

There are two types of keys available:

ICT This setting enables the Irreversible Color Trans-

form, meaning an internal conversion of the imag-

es’ colors prior to encoding. With this the colors of

the images will be encoded more efficiently. If the

check box is deactivated, the original colors of the

images will be used for the encoding, which would

normally result in a larger file size, but with the set-

ting Rate Control activated it will result in a lower

quality of the finalized material.

A deactivated setting ICT does not apply

a Reversible Color Transform (RCT).

High Quality This check box optimizes the quantization steps,

i.e. smaller steps will be used to encode the image,

resulting in a higher quality of the image. When

deactivated larger quantization steps will be used,

which would normally result in a smaller file size.

symmetric If the algorithm uses the same key during en- and

decryption, it is known as a symmetric key algorithm.

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DVS Clipster Specifications Page 38