00632    a2200169   4500003000500000005001700005040000900022082001000031100003100041245007700072260004200149300001400191505020100205538003100406650001400437651001100451Nust20170207153157.0  cNust  a005.8  aKhan, Samin Jan   (MSIS-5)  aA technique to discourage the relay attack on captchacSamin Jan Khan     bMCS(NUST)cFebruary, 2010aRawalpindi  ax, 71, p.  aIntroduction (page-1) Background/Literature survey (page-14) The proposed 3-Captcha machanism and its benefits (page-34) Implementation of proposed Captcha mechanism (page-40) Conclusion (page-52)  a  Almirah No.70 Shelf No.4  aPG Thesis  aMSIS-5