XOR (Scrambler) key extraction

XOR (Scrambler) key extraction Author: Chris Sampson, TRC Data Recovery Using Visual Nand Reconstructor, we are able to identify and extract new or unidentified Xor scrambler patterns in a (normally) relatively straight forward way. We do this using a little knowledge of the flash memory chip architecture which we then combine with the bitmap viewer…

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Scrambler pattern (XOR key) visual recognition

Scrambler (XOR key) pattern visual recognition AU6990 / ITE1171 / PS3016-P7-T / FC8708-C / PS2251-33BA / ITE1167BFN-46A / IT1165E-48B / PS2251-33BB-E Pattern (XOR key) period: 128/256/258 pages Page size: 8kb Visually looks like diagonals. Controller generates one page of pattern for first page in block, then cyclically shift it -1 byte (-8 bits) for next…

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