+ Russ Cox is a super-genius. Originally shared by Russ Cox ...

+Russ Cox is a super-genius.

Originally shared by Russ Cox:

This is Part 2 of "How to make QR codes like the ones I posted last week". Comments here post to the blog.

research!rsc: QArt Codes

Bill Sommerfeld - 2012-04-12 18:08:46-0400

this is sort of the opposite of the Shamir visual encryption/secret sharing paper.

(saw a talk about it at LCS years ago. superimpose 2 or more apparently random dot pictures and the encoded image pops out)