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Reminds me, lots of people take pictures of their driver's license or credit card or whatever using their smartphone and then use their smartphone's builtin ima
by qiqitori 4y ago
Reminds me, lots of people take pictures of their driver's license or credit card or whatever using their smartphone and then use their smartphone's builtin image editing tool to make the credit card number (or whatever) invisible before uploading the image to whatever service they need it for.
Sounds innocent right? Well, depending on the paintbrush tool used (this affects both Apple and Android) the number will be fully or partially recoverable, because the paintbrush is slightly translucent. The user will repeatedly cover up the number using the same paintbrush tool until they can't see the number anymore, but if you load the result in any (real) image editor and turn up the contrast in that area, you'll see the numbers.
- nukeman 4y agoThis reminds me of a similar story from Dr. Alex Wellerstein (historian of NUKEMAP fame). A Redditor he knew found some redacted nuclear weapons documents, and did the same trick, as the redactions were done with pieces of paper over the slides on a copier. Link: https://blog.nuclearsecrecy.com/2021/05/17/how-not-to-redact-a-warhead/ https://blog.nuclearsecrecy.com/2021/05/17/how-not-to-redact...
- actionablefiber 4y agoI can absolutely see this happening and it's absolutely, absolutely disgraceful that there is no dedicated, clearly marked redaction tool on iOS's image markup tool. I have only ever needed to use that markup for three things: to draw a circle around something, to draw an arrow pointing to something, or to redact something. Users need a tool on the markup editor that they can select and unambiguously know that if they draw a big black rectangle over something, it is going to be replaced by solid #000000 pixels and anything underneath will be impossible to retrieve.