روش جدید رمزگذاری تصویر با استفاده از بلوک بندی و نگاشت آشوب

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی برق و کامپیوتر - دانشگاه تبریز

چکیده

رمزگذاری یکی از قدرتمندترین ابزارهایی است که امنیت اطلاعات را در حوزه ارتباطات و فناوری اطلاعات تضمین می‌کند. رمزگذاری تصویر از سایر رمزگذاری‌ها متفاوت است. این تفاوت به دلیل ویژگی‌های ذاتی تصاویر است. آخرین تلاش‌ها در زمینه‌ی رمزگذاری تصاویر بر پایه‌ی آشوب بوده است. در این مقاله، یک الگوریتم جدید رمزگذاری مبتنی برآشوب برای رمزگذاری تصویر ارائه شده است. در روش پیشنهادی به ‌جای رمزگذاری یک تصویر در هر مرحله، چهار تصویر به‌صورت هم‌زمان رمزگذاری می‌شود. به ‌این‌ ترتیب که چهار تصویر استاندارد با همدیگر ترکیب شده و یک تصویر واحد از ترکیب آن‌ها به وجود می‌آید. رمزگذاری هم‌زمان چهار تصویر باعث پیچیده‌تر شدن الگوریتم رمزگذاری پیشنهادی، افزایش امنیت و همچنین گستردگی تغییر مقدار سطح خاکستری هر پیکسل خواهد شد. از نگاشت لجستیک آشوب برای تولید کلید و همچنین جابجایی بلوک‌های تصویر و تغییر مکان آن‌ها استفاده می‌شود. در نهایت تصویر حاصل با کلید رمزگذاری، XOR شده و تصویر رمزگذاری شده تولید می‌گردد. با توجه به ترکیب چهار تصویر و رمزگذاری هم‌زمان آن‌ها و بررسی تعداد زیادی از معیارهای ارزیابی تصویر ازجمله معیار آنتروپی اطلاعات که مقدار آن در الگوریتم پیشنهادی ما عدد9994/7 به دست آمده است و به مقدار ایده­آل 8 بسیار نزدیک‌ است، نشان می‌دهد که الگوریتم پیشنهادی ما از عملکرد خوبی برخوردار است.

کلیدواژه‌ها

عنوان مقاله [English]

A new method of image encryption using image blocking and chaos mapping

نویسندگان [English]

  • delavar zareai
  • Mohammad Ali Balafar
  • mohammad reza feizi derakhshi
Faculty of Electrical and Computer Engineering, University of Tabriz,
چکیده [English]

Encryption is one of the most powerful tools that ensures information security in the field of communication and information technology. Image encryption is different from other encryptions. This difference is due to the inherent characteristics of the images. Recent attempts to encrypt images have been based on chaos. In this paper, a new chaos-based encryption algorithm for image encryption is presented. In the proposed method, instead of encryption one image in each step, four images are encrypted simultaneously. In this way, four standard images are combined and a single image of their combination is created. Simultaneous encoding of four images will cause to complicate the proposed encryption algorithm, increase security, and extend the amount of gray area per pixel. Finally, the resulting image is XORed with encryption key and the encrypted image is generated. Considering the combination of four images and their simultaneous encoding, as well as examining a large number of image evaluation criteria, specifically the information entropy, that has achieved a value equal to 7/9994 in our proposed algorithm, which is really close to the ideal value of 8, shows that the proposed algorithm performs appropriately.

کلیدواژه‌ها [English]

  • Information security
  • image encryption
  • Chaotic logistics map
  • image blocking

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