...........অন্তরালে থাকব, তবুও ভাববো তোমায়......ভাববো তুমি ছিলে আমার কবিতার বনলতা সেন......

Trojan: Remember the Trojan Horse? Bad guys hid inside it until they could get into the city to do their evil deed. A trojan computer program is similar. It is a program which does an unauthorized function, hidden inside an authorized program. It does something other than what it claims to do, usually something malicious (although not necessarily!), and it is intended by the author to do whatever it does. If it's not intentional, its called a 'bug' or, in some cases, a feature Some virus scanning programs detect some trojans. Some virus scanning programs don't detect any trojans. No virus scanners detect all trojans. Virus: A virus is an independent program which reproduces itself. It may attach to other programs, it may create copies of itself (as in companion viruses). It may damage or corrupt data, change data, or degrade the performance of your system by utilizing resources such as memory or disk space. Some virus scanners detect some viruses. No virus scanners detect all viruses. No virus scanner can protect against "any and all viruses, known and unknown, now and forevermore". Worm: Made famous by Robert Morris, Jr. , worms are programs which reproduce by copying themselves over and over, system to system, using upresources and sometimes slowing down the systems. They are selfcontained and use the networks to spread, in much the same way virusesuse files to spread. Some people say the solution to viruses and wormsis to just not have any files or networks. They are probably correct.We would include computers. Logic Bomb: Code which will trigger a particular form of 'attack' when a designated condition is met. For instance, a logic bomb could delete all files on Dec. 5th. Unlike a virus, a logic bomb does not make copies of itself.