Intro Getting started - QTextReversing MS-DOS binariesPKZipint 3f - MS-DOS OverlaysKey expansion functionTracing through passcode flowKey derivation functionReversing the key derivationReversing the first stage - 4 bytes to 4 printable charactersReversing the second stage - 16 bytes to 𝟦×𝟦 byte stringPutting it all togetherIntroIn August 2020, we were commissioned by a client with a cache of locked QText documents from the mid 90s - to which he has lost the passcode.QText was a DOS era Hebrew-...