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Test design: Discrete Cosine Transform, 2015. | by Rosa Menkman
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Test design: Discrete Cosine Transform, 2015.

The legibility of an encry

pted message does not just

depend on the complexity

of the encryption algorith

m, but also on the placeme

nt. DCT is used to describ

e a finite set of patterns

, called macroblocks, that

could be described as the

64 character making up th

e JPEG image, adding lumo

and chroma values as inton

ation. If an image is comp

ressed correctly, its macr

oblocks become invisible.

The incidental trace of th

e macroblocks is generally

ignored as atifact or err

or.Keeping this in mind, I

developed DCT. DCT uses t

he esthetics of JPEG macro

blocks to mask its secret

message as error. The encr

ypted message, hidden on i

mage is only legible by th

e ones in the know.///////




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Uploaded on September 24, 2015