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I'm trying to find a story I read in a printed book in the UK around 1990.

It was aimed at kids, probably about computers, and had some line drawings.

The only bit I can really remember is a couple of kids going to see a bed-bound kid who is lying down wearing prism glasses so he could see his computer screen and having a discussion of the "Knapsack" encryption system. I seem to recall the line picture of this on the left hand side.

I think it was a "children's novel" rather than a short story.

Any ideas of this vague recollection?

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