| Digital image transformation belonging to information security is one divarication of information hiding. Digital image transformation is a way to encrypt information, which is a hotspot of international research because of its important value of theory and application.The article introduces the background of digital image transformation, present status of international research. Then it explains basic concepts and knowledge of digital image transformation, such as common arithmetic, criterion and so on.Based on these researches, arithmetic is improved and extended. Toral arithmetic of more dimensions and magic transformation based on prime number are exhibited. Examples indicate new arithmetic is faster to need less time and safer to resist attack. |
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