Pwning library cards
Pwning library cards
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TL;DR:
Hacking is bad
Process
Why
I lost my library card but had seomeone else’s that belonged to the same library.
Physical
I scanned the barcode using Binary Eye (fdroid) (best scanner.) It was a 16-character CODABAR barcode mesasuring just under 2in/5cm wide and 1/4in/1cm long.
Formatting
The First and last bytes were “A”, with 14 ASCII-encoded numbers between them. I replicated the bar code, printed it off, and got into my account.