APPARATUS AND METHOD FOR ENCRYPTING/DECRYPTING INFORMATION ON A PIXEL-BY-PIXEL BASIS AND ENCRYPTION/DECRYPTION SYSTEM USING THE SAME

摘要

An apparatus and method for encrypting/decrypting information, and the encrypting/decrypting system using the same, and a computer readable recording medium storing programs for realizing the above are disclosed. The method for encrypting/decrypting an image includes the steps of: a) receiving an information to be encrypted; b) generating a random number map for a encryption; c) decomposing the information to be encrypted into a plurality of pixels; d) performing multi step encryption by changing a position and a color of the pixel using the random number map for the encryption, and generating encrypted information; e) outputting the encrypted information; f) receiving the encrypted information; g) gaining a security code for decoding the encrypted information; h) generating a random number map for a decryption; i) performing a multi step decryption by inverse-changing a position and a color of the pixel of the encrypted information using the random number map for the decryption; j) restoring an original image by combining the decrypted pixels and generating a restored information; and k) outputting the restored information.