By Kris Kaspersky
A handbook on conserving CDs opposed to unlawful copying, this publication indicates how crackers replica CDs utilizing a variety of entry equipment. The tools coated comprise the CDFS motive force, cooked mode, SPTI, ASPI, the SCSI port, and the MSCDEX driving force. defined is how you can hinder cracker break-ins utilizing protections in accordance with nonstandard CD codecs akin to the CD motive force and susceptible CD sectors. details on CD functioning basics and counsel concerning CD safety in a structure freed from math and assembling-such as information codecs, the scrambler, the Reed-Solomon coder/encoder, the CIRC coder/encoder, and a weak-sectors generator-are additionally supplied. the most application interfaces, which offer direct regulate through peripheral units at the program point in UNIX, Novell, and home windows 9x/NT/2000/XP, are thought of, as is tips on how to learn and write uncooked sectors.
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Additional info for CD Cracking Uncovered: Protection against Unsanctioned CD Copying
If the corruption involves the least significant bits of a byte, this might remain undetectable to the human ear (even that of a true music lover). However, if corruption involves the most significant bits, this corruption can be heard by the human ear as a sharp click, noticeable even for those who are hard of hearing. ” However, this is a half-measure, as most of you will understand! High-quality audio grabbing on such drives is virtually impossible. Moreover, some CD manufacturers, keen on protecting their products from unauthorized copying, began to introduce a large number of irrecoverable errors into their products intentionally.
The Hamming distance between k and the original symbol is equal to the number of inverted bits (e. , two in our case), while the distance to the nearest valid symbol is equal to d – k (3, in our case). In other words, while d – k > k, the decoder is guaranteed to restore the original symbol. In cases when d > k > d – k, successful restoration is not guaranteed. However, under favorable conditions it is possible in principle. Returning to our symbol 0000011111, let us corrupt 4 bits: 0100110101 and try to restore the original symbol.
As can be easily seen, no matter by which number we multiply g—by 0, by 1, 2, or 3. Either way, the result will be exactly divisible by g only in case if no one of its bits is inverted (or, simply speaking, that there are no single errors). The remainder from the division is a clear indication of the position in which the error has occurred (provided that it is a single error, because this algorithm is incapable of correcting group errors). To be more precise, if the error occurred in position x, then remainder of division will be equal to k = 2x.
CD Cracking Uncovered: Protection against Unsanctioned CD Copying by Kris Kaspersky