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slides3 - CS 531, Fall 2007 CS531 HW2 Bill Cheng

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T 1 CS 531, Fall 2007 Copyright © William C. Cheng CS531 HW2 Bill Cheng http://merlot.usc.edu/cs531-f07
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Invented by Naor and Shamir (presented at EUROCRYPT ’94) see Doug Stinson’s Visual Cryptography Page 0 1 input pixel merged shares 0 1 key output share #1 output share #2 p=0.5 p=0.5 input pixel merged shares p=0.5 p=0.5 key output share #1 output share #2 2x data expansion 4x data expansion application: secret splitting perfect secrecy (just like a one-time pad) T 2 Visual Cryptography CS 531, Fall 2007 Copyright © William C. Cheng
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Ex: T 3 Visual Cryptography Example CS 531, Fall 2007 Copyright © William C. Cheng
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Ex: original image T 4 Visual Cryptography Example (Cont. ..) CS 531, Fall 2007 Copyright © William C. Cheng
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T 5 PBM CS 531, Fall 2007 Copyright © William C. Cheng "P4\n" Format: "<width> <height> \n " if <width> is divisible by 8 <height>*<width>/8 bytes follows if <width> is not divisible by 8 <height>*(<width>/8)+1) bytes follows on outputing, you must use 0 as the padding bit at the end of each row on inputing, you must ignore the padding bits
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T 6 Commandline Syntax CS 531, Fall 2007 Copyright © William C. Cheng
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slides3 - CS 531, Fall 2007 CS531 HW2 Bill Cheng

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