Created by the E-PoliceSlide 122 February, 2012 Dangers of s By Michael Kuc

Created by the E-PoliceSlide 222 February, 2012 VIRUSES A computer virus is a computer program that can copy itself and infect a computer. The term "virus" is also commonly but erroneously used to refer to other types of malware As stated above, the term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, even those that do not have the reproductive ability. Malware includes computer viruses, computer worms, Trojan horses, most rootkits, spyware, dishonest adware and other malicious and unwanted software, including true viruses. Viruses are sometimes confused with worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself automatically to other computers through networks, while a Trojan horse is a program that appears harmless but hides malicious functions. Worms and Trojan horses, like viruses, may harm a computer system's data or performance. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or simply do nothing to call attention to themselves. Some viruses do nothing beyond reproducing themselves.

Created by the E-PoliceSlide 322 February, 2012 Trojan Horses A Trojan horse, or Trojan, is software that appears to perform a desirable function for the user prior to run or install, but (perhaps in addition to the expected function) steals information or harms the system. Trojan horses may allow a hacker remote access to a target computer system. Once a Trojan horse has been installed on a target computer system, a hacker may have access to the computer remotely and perform various operations, limited by user privileges on the target computer system and the design of the Trojan horse. Operations that could be performed by a hacker on a target computer system include: Use of the machine as part of a botnet (e.g. to perform automated spamming or to distribute Denial-of-service attacks) Data theft (e.g. retrieving passwords or credit card information) Installation of software, including third-party malware Downloading or uploading of files on the user's computer Modification or deletion of files Keystroke logging Watching the user's screen Crashing the computer

Created by the E-PoliceSlide 422 February, 2012 Phishing ! Phishing is a way of attempting to acquire sensitive information such as usernames, passwords and credit card details by masquerading as a trustworthy entity in an electronic communication. Communications purporting to be from popular social web sites, auction sites, online payment processors or IT administrators are commonly used to lure the unsuspecting public. Phishing is typically carried out by e- mail or instant messaging and it often directs users to enter details at a fake website whose look and feel are almost identical to the legitimate one. Phishing is an example of social engineering techniques used to fool users, and exploits the poor usability of current web security technologies. Attempts to deal with the growing number of reported phishing incidents include legislation, user training, public awareness, and technical security measures.

Created by the E-PoliceSlide 522 February, 2012 Spam Spam definition spam, known as unsolicited bulk (UBE), junk mail, or unsolicited commercial (UCE), is the practice of sending unwanted messages, frequently with commercial content, in large quantities to an indiscriminate set of recipients. Problems with spam Spam in started to become a problem when the Internet was opened up to the general public in the mid-1990s. It grew exponentially over the following years, and today composes some 80 to 85% of all the in the world, by a "conservative estimate". Pressure to make spam illegal has been successful in some jurisdictions, but less so in others. Spammers take advantage of this fact, and frequently outsource parts of their operations to countries where spamming will not get them into legal trouble.