fzdp itu];
Computer virus
fzdp cyfpy; ghupa jhf;fj;ij Vw;gLj;Jk; xU computer program ,id ehk; fzdp itu]; vd;fpNwhk;. [VIRUS – Vitual Information Resources Under Seiwagw) ,J fzdpapy; Hardware ,y; my;yJ Operating system ,y; FWf;fPLfis Vw;gLj;jp fzdpapd; nray; Ntfj;ijf; Fiwj;Njh my;yJ jfty;fis epiyFiya itj;Njh tpLfpwJ. itu];fs; jkJ gpujpfis cUthf;ff;$bajhfTk; (Self replicate) fzdpapy; cl;GFe;j gpd; vt;tpj mwpFwpfisAk; ntspf;fhl;lhjthWk; cUthf;fg;gLfpd;wd. jdf;F toq;fg;gl;l gzpiar; nra;JKbj;j gpd;dHjhd; itu]; Eioe;Js;sJ vd;gijf; fzdp fhl;Lk;. ,t;thW xOq;fikf;fg;gl;l fl;lisfs; itu];fspd; Pay load vdg;gLk;. itut];fs; ,ytr Software fshfNt ntspaplg;gLfpd;wd.
1949Mk; Mz;by; Princeton, Newjercy ,y; cs;s Institute for Advanced study vd;Dk; epWtdj;ijr; NrHe;j `q;Nfup> mnkupf;fhitr; NrHe;j fzpjtpayhsH John Von Numann vd;gtH jhkhfNt jkJ gpujpfisg; ngUf;ff;$ba xU Computer Program ,id nfhs;if uPjpahf Kd;itj;jhH. ,jid Bell Laboratory ,dH Core wars vd;Dk; tpisahl;lhfg; guPl;rpj;Jg; ghHj;jdH. ,jid tpisahba tPuHfs; vjpupfspd; fzdpj; njhFjpapy; jhf;fj;ij Vw;gLj;Jjy;> mjd; gFjpfis mopj;jy; kw;Wk; njhFjpia tpahgpj;jy; Mfpa nraw;ghLfis cs;slf;fpa kpfr;rpwpa Computer program fis cUthf;Ftjhff; fhzg;gl;lJ. 1983,y; mnkupf;fhitr; NrHe;j kpd; nghwpapayhsH Fred cohon vd;gtH jhk; khztuhf ,Ue;jNghNj jhkhfNt gpujpfisg; ngUf;Fk; Computer program ,id tpgupf;f Virus vd;Dk; gjj;jpid Kjd;Kjypy; cgNahfpj;jhH.
1986,y; Kjy; Brain Virus cUthf;fg;gl;lJ. 1988 ,y; NkYk; ,U Gjpa itu];fs; cUthf;fg;gl;ld.
(i) Stone virus - ,Jjhd; Kjy; Bootstrap sector virus MFk;.
(ii) Internet worm 1989,y; mjpNtfkhfg; guTk; (Fast infactor) Dark Avenger virus ck; ,jidj; njhlHe;J 1990,y; Kjd;Kjy; Polymorphic virus ck; cUthf;fg;gl;lJ. 1995,y; win work concept vDk; Kjy; macro language virus cUthf;fg;gl;lJ. ,J xU Legitimate program ,d; nraw;ghLfisf; fl;Lg;gLj;JtJld; ve;j xU fzdpiaNah my;yJ Operating system ,idNah jhf;fty;yJ.
,it iturpdhy; ghjpf;fg;gl;l Floppy disk ,id cgNahfpj;J fzdpia Boot gz;Zk; NghJ my;yJ iturpdhy; ghjpf;fg;gl;l xU Program I run gz;Zk; NghNjh fzdpapDl; GFfpd;wd. ,t;thW cl;GFe;j itu];fs; jkJ efy;fis floppy disks, Hard derive, Legitimate computer programs Mfpatw;wpy; jkJ gpujpfis cUthf;fpNah computemr network syste ,D}lhf gpujpfis cUthf;fpNah nkd;NkYk; gutpf;nfhs;Sk;.
jw;NghJ 6 tifahd itu];fs; ,dq;fz;lwpag;gl;Ls;sd.
(i) Parasitic virus
(ii) Boot strap sector virus
(iii) Multi partite virus
(iv) Companion virus
(v) Link virus
(vi) Data file virus
itu];fspd; ,Ug;igf; fz;lwptjw;fhfg; gy Antivirus softwarw fs; cgNahfpf;fg;gLfpd;wd. itu]pd; computer code ,d; ,ay;Gfis mwpe;J mjdbg;gilapy; fzdpapd; File fspypUe;J itu];fis Njb mtw;iw ePf;f cjTgit Sasnning software MFk;. fzpjtpay; fzpg;gPLfis cgNahfpj;J Executable program xd;wpd; epiyia> mjid run gz;z Kd;Gk; gpd;Gk; xg;GNehf;Ftjd; %yk; itu]; jhf;fk; Vw;gl;Ls;sjh? ,y;iyah vd mwpe;J mtw;iw ePf;f cjTgit check summing software MFk;. ,e;j software kl;LNk vt;tifahd itu]; jhf;fj;jpidAk; fz;lwpAk;. rl;ltpNuhjkhd my;yJ ghJ}ukhd ghjpg;ig Vw;gLj;Jk; virus nraw;ghLfis ,dq;fhz cjTgit Monitoring software MFk;. ,t;thwhfg; gy antivirus software ,Ue;jNghJk; ,tw;wpd; gpbf;Fs; mfg;glhjthW Mdhy;> ghjpg;ig Vw;gLj;jf;$ba Gjpa Gjpa itu];fs; jw;NghJ cUthf;fg;gLfpd;wd. Mapuj;jpw;Fk; Nkw;gl;l itu];fs; jw;NghJ mwpag;gl;Ls;sd. ve;jtifahd itu];fs; vdpDk; write – protected floppy disk ,Ds; kl;Lk; cl;GfKbtjpy;iy. vdNt itu]; jhf;fk; Vw;gl;Ls;sij mwpe;jTld; cldbahff; fzdpapid Network system ,ypUe;J tpyf;FtJld; file gupkhw;wq;fisAk; epWj;j Ntz;Lk;. gpd;dH kPz;Lk; write protected floppy disk I cgNahfpj;J Muk;gpj;J (Restart) ghjpg;Gf;Fs;shd file fis ePf;fp mjw;Fg; gjpyhf back up disk ,ypUe;J lightimate file fis itf;f Ntz;Lk;. mj;Jld; boot sector ,y; VjhtJ itu]; ,Ug;gpd; mtw;iwAk; ePf;fNtz;Lk;. ,t;thW nra;tNj fzdpapy; Vw;gl;l itui] ePf;fr; rpwe;j topKiwahff; fUjg;gLfpwJ.
cUthf;fk; : jpU.rp.rptr;nry;td;.
