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How to return well-formed XML from WebServices without the DOM: from XmlReader and XPathNavigator

Journals of a professional hacker. Tips on how to secure your system.
The Accidental Hacker: "RemotelyPossible/3"

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How the LUHN-10 Algorithm Works
http://www.ee.unb.ca/tervo/ee4253/luhn.html
If a 'weighted sum' is constructed by multiplying adjacent digits by a different constant (in this case, either 1 or 2) the problem of adjacent swapped digits going undetected can be eliminated. A checksum is constructed from the sum of the resulting digits. If a product results in two digits (e.g. 2x6=12), the individual digits (1 and 2) are added separately into the checksum. The final digit is computed so that the weighted sum is an exact multiple of 10. In other words, the overall sum "modulus 10" equals zero. In this case, 70 is an exact multiple of ten.


4 5 6 3 9 6 0 1 2 2 0 0 1 9 9 9
x2 x1 x2 x1 x2 x1 x2 x1 x2 x1 x2 x1 x2 x1 x2 x1
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
8 5 12 3 18 6 0 1 2 2 0 0 2 9 18 9
8 + 5 +1+2+ 3 +1+8+ 6 + 0 + 1 + 2 + 2 + 0 + 0 + 2 + 9 +1+8+ 9 = 70




70 = 0 mod 10
The number is correct if a zero result is obtained.
It is important when applying this method to numbers of different lengths that the rightmost digit (the check digit) is always multiplied by 1 and not by 2.

It can be observed that the presence or absence of leading zeros in a number to be checked has no effect on the result. (e.g. 8913105 or 08913105 or 00008913105 would all pass the test)

Boot Disk Windows XP 2000 NT NTFS.com: "NTFS.com > Data Recovery Software - NTFS Reader for DOS > NTFS Boot Disk
DOS NTFS boot disk to access NTFS partitions in Windows XP 2000 or NT
How to make DOS boot disk to access NTFS partitions in Windows ?
Download self-extracting Bootable Floppy Disk Creator for NTFS Reader.
Insert floppy disk and run NtfsFloppySetup.exe
Follow the instructions on the screen
To access NTFS drives from DOS :
Reboot your computer from a new boot disk.
The program (ReadNTFS.exe) will start automatically from autoexec.bat

Note: You can use NTFSDOS boot disk to access NTFS drives in Windows 98 95 and 3.1. This is a DOS program, but can be run from Windows.
"

Data Recovery Software. NTFS Reader for DOS NTFS DOS. Freeware & Shareware.: "NTFS Reader DOS Boot Disk provides read access to NTFS drives from the MS DOS environment. It supports long filenames as well as compressed and fragmented files. NTFS Reader for DOS allows you to preview the files on NTFS and copy them from NTFS to FAT volumes or network drives. In order to use the software you need to copy the readntfs.exe file to a bootable floppy disk and boot from it.
NTFS Reader for DOS is a FREEWARE
Software features:
Can be saved and run from bootable floppy (download boot disk image)
Displays complete physical and logical drive information
Supports IDE / ATA / SCSI drives
Supports large (more than 8GB) Hard Drive
Supports NTFS, NTFS5 file systems for reading
Supports FAT12, FAT16, FAT32 file systems for data writing
Supports compressed and fragmented files on NTFS
Supports partitions created in MS-DOS, Windows XP.2000.NT.ME.98.95
Displays non-english and long file names
Ability to preview file(s)/folder(s) before copying
Supports search by file name or mask
Disk Viewer displays content of the file in Hex/Text mode "

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