>>>>> "JY" == John Young <j...@pipeline.com> writes:
JY> Two types of PDF programs were used. Thus the redactions made JY> by likely different means and therefore possibly different means JY> might be used to lift the redactions. A quick look shows that both files use DCT-compressed 300-dpi images for each page; they may be scans. Attempts to unredact should treat the pages as the jpegs they are. I suspect matching the font and testing pixel lengths at 300 dpi may be the only productive attack, but there is variation in the intensity of the pixels in the redaction; perhaps something can be found by analyzing it as pixel data? Or perhaps the variation is just a combination of quantum noise from the scan and jpeg/DCT artifacts? -JimC -- James Cloos <cl...@jhcloos.com> OpenPGP: 1024D/ED7DAEA6 _______________________________________________ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
