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data One tool to help in this regard is Cookie Pal from Kookaburra Software at http://wwwkburracom/cpalhtml It can be set to warn you when web sites attempt to set cookies, enabling you to see what s going on behind the scenes so you can decide whether you want to allow such activity Microsoft s Internet Explorer has a built-in cookie screening feature, available under the Internet Options control panel, Security tab, Internet Zone, Custom Level, Prompt for persistent and per-session cookies Netscape browser cookie behavior is set via Edit | Preferences | Advanced, and checking either Warn Me Before Accepting A Cookie or Disable Cookies (see Figure 16-3) For those cookies that you do accept, check them out if they are written to disk, and see if the site is storing any personal information about you Also remember, if you visit a site that uses cookies for authentication, they should at least use SSL to encrypt the initial post of your username and password so that it doesn t just show up as plaintext in PeepNet We d prefer to disable cookies outright, but many of the sites we frequent often require them to be enabled For example, Microsoft s wildly popular Hotmail service requires cookies to be enabled in order to log in Because Hotmail rotates among various authentication servers, it isn t easy just to add Hotmail to the Trusted Sites zone under Internet Options (as we describe in the earlier section, Using Security Zones Wisely ) You could use the *hotmailcom notation to help out here Cookies are an imperfect solution to inadequacies in HTTP, but the alternatives are probably much worse (for example, appending an identifier to URLs that may be stored on proxies) Until someone comes up with a better idea, monitoring cookies using the tools referenced earlier is the only solution.

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3 Letterbox ( shrink and matte ) This is the alternate way of showing widescreen video on a standard TV, preferred by videophiles and popularized by laserdiscs The original theatrical image is boxed into the 4:3 frame by adding black mattes to the top and bottom of the picture 4 Widescreen ( accordion squeeze ) One of the advantages of DVD-Video for home theater systems is widescreen support DVD supports wide images by using a 16:9 (178) aspect ratio that is anamorphically squeezed into a 4:3 TV shape before being stored on the disc19 (The 4:3 ratio can be expressed as 12:9, so in order to get from 16:9 to 12:9, the width needs to be reduced by 25 percent, from 16 down to 12) Widescreen televisions have a wider scanning pattern to display the full 16:9 shape DVD players also can display widescreen video on a standard 4:3 TV20 There are three ways to do this, including two options similar to those performed during video transfer, but in this case they are performed by the player

Popularity: Simplicity: Impact: Risk Rating: 5 8 2 5

Figure 5-61 When creating the transaction code enter in the required program name, screen number, etc

Automatic letterbox All DVD players can add letterbox mattes when displaying widescreen video on a 4:3 display The player actually squeezes the image vertically by 25 percent (the same amount it was squeezed horizontally in the anamorphic process) so that its proper proportions are restored Automatic pan and scan Center-of-interest information can be included with the widescreen video to tell the player which part to extract The player chops off the indicated amount from each side and then unsqueezes the remaining picture to create a 4:3 image for the TV Lie to the player A DVD player has no way to know what kind of TV you have, so you can tell it to send a 16:9 picture to a 4:3 TV You will

Some people prefer to think of anamorphic video as being stretched vertically rather than squeezed horizontally The difference is largely a matter of semantics If anamorphic video were stretched vertically from a letterboxed source after being transferred from film to video, it would lose resolution, but in practice, it happens during the transfer process, so it is largely a matter of perspective whether you think of the video as being squeezed horizontally or stretched vertically Matching the source to the height of the 4:3 shape and squeezing horizontally comes out the same as matching the width of the 4:3 shape and stretching vertically A widescreen TV increases horizontal sweep to stretch anamorphic video from a standard NTSC signal, whereas some 4:3 TVs decrease vertical scan pitch to achieve a 16:9 aspect ratio, so either point of view is valid

Here s a scary thought: IE users clicking a purposely crafted URL are potentially vulnerable to having their cookies revealed Bennett Haselton and Jamie McCarthy of Peacefire have posted a script at http://wwwpeacefireorg/security/iecookies that makes this thought a reality It extracts cookies from the client machine simply by clicking a link within this page The contents of cookies residing on the user s machine are readable by this script, and thus are accessible to web site operators This can also be used to nasty effect when sent within inline frame (IFRAME) tags embedded in HTML on a web page (or in HTML-formatted email messages or newsgroup

Figure 5-62 The settings for the new transaction code are complete When used, the systm will verify the new details should one select System Status

Anamorphic video is not unique to DVD There are a few anamorphic laserdiscs and even rare anamorphic videotapes The problem is that they can only be viewed properly on a widescreen TV Unlike DVD players, standard laserdisc players and VCRs are unable to adapt anamorphic video for standard TVs

posts) The following example suggested by Internet security consultant Richard M Smith points out how IFRAME could be used in conjunction with the Peacefire exploit to steal cookies:

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