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have the same file size and can be changed to have the same date as the original programs so relying on standard identification techniques will not suffice You ll need a cryptographic checksum program to perform a unique signature for each binary file and need to store these signatures in a secure manner (such as a disk offsite in a safe deposit box) Programs like Tripwire (http://wwwtripwirecom) and md5sum are the most popular checksumming tools, enabling you to record a unique signature for all your programs and to definitively determine when attackers have changed a binary Oftentimes admins will forget about creating checksums until after a compromise has been detected Obviously, this is not the ideal solution Luckily, some systems have package management functionality that already has strong hashing built in For example, many flavors of Linux use the RedHat Package Manager (RPM) format Part of the RPM specification includes MD5 checksums So how can this help after a compromise By using a known good copy of rpm, you can query a package that has not been compromised to see if any binaries associated with that package were changed:

CHAPTER 3:

Choose your printer, which sheets to print, and how many copies to generate all within the Print dialog box

[@shadow]# rpm -Vvp ftp://ftpredhatcom/pub/redhat/\ redhat-62/i386/RedHat/RPMS/fileutils-40-21i386rpm S5T /bin/ls

The CTRL-P keyboard shortcut sends a default print job (one copy of every page in the active sheet) to the default printer (or the printer you last used in the current Excel session), offering no dialog box for you to use in customizing the print job To get around this, you can set a print area for your worksheet so that you can use CTRL-P to do a quick print of a section of your worksheet Select the area to be printed and then choose File | Print Area | Set Print Area Until you clear the print area (File | Print Area | Clear Print Area), the designated print area will be what s printed if you press CTRL-P

You might think your Office Live site is all about you But, if you think this, you re missing the point Many web sites are personal in orientation and they exist to give their owners a forum for promoting themselves or spreading their views and opinions Office Live can be used for personal web sites, but it s primarily intended for business web site owners Commercial web sites aren t about their owners they re all about addressing the needs and desires of specific clients or customers Identifying the people you want to reach is an essential part of making a web site successful The following gives you some suggestions

In our example, /bin/ls is part of the fileutils package for RedHat 62 We can see that /bin/ls has been changed by the existence of the 5 earlier This means that the MD5 checksum is different between the binary and the package a good indication that this box is owned For Solaris systems, a complete database of known MD5 sums can be obtained from http://sunsolvesuncom/pub-cgi/fileFingerprintspl This is the Solaris Fingerprint Database maintained by Sun and will come in handy one day if you are a Solaris admin Of course, once your system has been compromised, never rely on backup tapes to restore your system they are most likely infected as well To properly recover from an attack, you ll have to rebuild your system from the original media

the iceberg, however For example, what if you only want to print part of your worksheet Or if your worksheet is large, what if you need it all to fit on one sheet of paper Excel makes it possible to customize your printout to meet your needs The first thing to know: By default, when you choose to print (by choosing File | Print or by clicking the Print button on the toolbar), the active worksheet is printed If you want to print more than one of your sheets or only some of the pages in a particular sheet, or if you want to print the entire workbook (all the sheets), you have to request it through the Print dialog box The second, and perhaps the more important thing to know: By default, Excel will print your worksheets on as many sheets as it needs to If, based on the amount of content and your formatting, a worksheet spans four pages, your worksheet will print on four sheets of paper, the breaks between them indicated by dashed lines running along certain columns and rows on your worksheet