DESIGN AND BUILD LOGIN SYSTEM SECURITY USING CAPTCHA METHOD

Abstract

In general, image CAPTCHA form containing the letters or numbers tampered with various types of noise. This test involves the user to type in the result of guesses letters or numbers in the image. But sometimes there are still many who do not know the web of CAPTCHA security level of the display, so that spam can still be disguised as humans to access and attack web. In this thesis, we have created a simulation of automated reader system for multiline CAPTCHA background, which contains the text of a number that the character length totaling 6. To solve the existing text in the CAPTCHA, conducted several process steps, namely typing a sequence of numbers and letters that are arranged in the image to be typed on a column that is already available right below as well as doing an introduction to the numeric character itself, and read what was published in the CAPTCHA.. MD5 is used in authentication purposes, where the MD5 document integrity and authenticity can be proven. MD5 is also used in digital signature applications (signer of a digital document) as fingerprinting function.Keywords: CAPTCHA, MD5, Encryption