Web hosting control panel - SecuritySecurity is not a joking matter, proclaim signs
SecuritySecurity is not a joking matter, proclaim signs at airports every- where. The same sign should be posted near your PHP server. Anyone connecting a server to the Internet must take proper securitymeasures or risk loss of data or even money to the keystrokes ofmalicious crackers. The mantra of the security-conscious site designer is: Don t trust thenetwork.If you re worried about the security of your site, chant thismantra as you code your pages. Any information transmitted to yourserver via the network be it a URL, data from an HTML form, ordata on some other network port should be treated as potentiallyhazardous. This chapter suggests several techniques for sanitizingincoming information. You should apply these techniques and spendsome time trying to discover other potential hazards and ways toprevent them. The second rule of thumb for a secure site is: Minimize the damage. What if the program you just wrote, which you are sureis secure, is actually vulnerable? Just to be on the safe side, limit the damage an intruder can cause after he or she has taken advantage of the vulnerability. When visitors come to your site, they trust that it contains validinformation, that it is not harmful to them or to their computers, andthat any information they provide to it is handled properly. Interactingwith a site, whether an e-business, recreational, or informational site, involves certain security risks for a visitor. As a site designer, it is yourresponsibility to protect visitors from these risks. Besides being suretheir information is safe on your server, this means you should takemeasures to safeguard their information while it is in transit fromtheir computers to your server. But all this should not scare you away from putting your e-businessonline. The first section of this chapter describes some possibleattacks against your server and ways to avoid them. We then discusscryptographic techniques for protecting your data. At the end of thischapter, we list some Web sites that contain up-to-the-minute infor- mation on the latest cracker techniques. By watching these sites, youmay learn of possible security vulnerabilities before an attacker doesand, thereby, avoid disaster. 2929CHAPTER …In This ChapterPossible attacksRegister_GlobalsFile uploadsEncryption …
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