ارائه يك روش پنهان نگاري امن براي تصاوير ديجيتال مبتني بر الگوريتم بهينه سازي ازدحام ذرات

A secure steganography method for digital images based particle swarm optimization algorithm

تصاوير، مهم¬ترين رسانه مورد استفاده به خصوص در اينترنت هستند و درك تصويري انسان از تغييرات در تصاوير محدود است. تصاوير نوعي رسانه پوششي مناسب در پنهان‌نگاري محسوب مي¬شوند و الگوريتم¬هاي پنهان نگاري متعددي براي ساختارهاي مختلف تصاوير ارائه شده است، كه حملات براي شكستن پيام مخفي در اين مورد مطرح مي‌شود. استفاده از روش¬هاي فرا اكتشافي مي¬تواند به افزايش ظرفيت مخفي¬سازي و امنيت داده براي پنهان كردن اطلاعات كمك كند. بنابراين در اين مقاله به ارائه يك روش پنهان¬نگاري امن براي تصاوير ديجيتالي مبتني بر الگوريتم بهينه¬سازي ازدحام ذرات (PSO) پرداخته مي¬شود. نتايج نشان مي¬دهد كه استفاده از طرح پيشنهادي، باعث تعادل خوب بين امنيت و كيفيت تصوير و همچنين كاهش تفاوت خطا بين تصوير پوشش و نهان‌نگاري شده مي¬شود.

Steganography branch of science, called hide information. Knowledge hide information includes several branches including, encryption, watermarks and so. Generally in information concealment systems three basic elements of capacity, security and resistance are involved. In Steganography methods, elements Capacity and security are primary importance. In todays world, invisible essence and paper which used in the past to Communicating secretly by more practical media, such as audio-video - Audio files have been replaced. Because this digital media with a large data redundancy that can be used as a suitable cover to hide the message. Images an important part of the media, especially in Internet and human visual perception of changes in images is limited. Images Kind of suitable coverage media are considered in steganography And several Steganography algorithms for different structures of Images is provided, Attacks to break the hidden message in this case arises. use of methods of Meta-heuristic Can To increase the hide capacity and Data security and help to conceal information. So in this thesis is paid to provide a secure Steganography method for digital images based on particle swarm optimization (PSO) algorithm. The results show that the use of proposed scheme, A good balance between security and image quality as well as reduce the error difference between the image of the cover and stgo-image.