Efficient Network Security

n cmptng, ntrnt Prtcl Scrty (Psc) s scr ntwrk prtcl st tht thntcts nd ncrypts pckts f dt t prvd scr ncryptd cmmnctn btwn tw cmptrs vr n ntrnt Prtcl ntwrk. t s sd n vrtl prvt ntwrks (VPNs). Psc nclds prtcls fr stblshng mtl thntctn btwn gnts t th bgnnng f sssn nd ngttn f cryptgrphc kys t s drng th sssn. Psc cn prtct dt flws btwn pr f hsts (hst-t-hst), btwn pr f scrty gtwys (ntwrk-t-ntwrk), r btwn scrty gtwy nd hst (ntwrk-t-hst). Psc ss cryptgrphc scrty srvcs t prtct cmmnctns vr ntrnt Prtcl (P) ntwrks. t spprts ntwrk-lvl pr thntctn, dt rgn thntctn, dt ntgrty, dt cnfdntlty (ncryptn), nd prtctn frm rply ttcks. Th prtcl ws dsgnd by cmmtt nstd f bng dsgnd v cmpttn. Sm xprts crtczd t, sttng tht t s cmplx nd wth lt f ptns, whch hs dvsttng ffct n scrty stndrd. Thr s llgd ntrfrnc f NS t wkn ts scrty ftrs.