Rosa Menkman, Discrete Cosine Transform, 2015. [click image to download the ttf]
A new work for the exhibition "Design my Privacy" opening at MOTI museum on the 3rd of October.
The legibility of an encrypted message does not just depend on the complexity of the encryption algorithm, but also on the placement of the data of the message. The Discreet Cosine Transform is a mathematical technique. In the case of the JPEG compression, a DCT is used to describe a finite set of patterns, called macroblocks, that could be described as the 64 character making up the JPEG image, adding lumo and chroma values as ‘intonation’. If an image is compressed correctly, its macroblocks become ‘invisible’. The incidental trace of the macroblocks is generally ignored as artifact or error. Keeping this in mind, I developed DCT. DCT uses the esthetics of JPEG macroblocks to mask its secret message as error. The encrypted message, hidden on the surface of the image is only legible by the ones in the know.
A first iteration of this work was made for the iRD, at Transfer Gallery in 2015.