PingPong256을 활용한 이미지 암호화 제안
Proposed image encryption method using PingPong256
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초록
본 논문에서 우리는 PingPong256은 LFSR과 가변클록을 결합하여 불규칙한 PRNG를 생성하고이를 이미지 암호화에 활용하는 방법을 제안한다. PingPong256은 2개의 LFSR을 기반으로 긴 주기가 보장되며, 가변클록은 서로 다른 LFSR의 상태를 참조하여 1회 동작시 임의의 클록만큼 동작한결과를 출력하는 구조이다. 가변클록은 시간이 경과함에 따라 선택지가 증가하기 때문에 임의의시간에 출력을 예측하기 어렵다는 특성으로 나타난다. PingPong256은 LFSR과 가변클록과 하드웨어 및 소프트웨어 구현의 편리함이라는 장점 및 민감성과 불규칙한 주기라는 장점을 결합한 것이다. 또한 NIST SP800-22를 사용하여 통계적 안전성을 검증하고 제안 된 방법의 안전성을 확인하고 NPCR 및 UACI를 사용하여 이미지 변화의 감도를 테스트 하였습니다.
Abstract
In this paper, we propose a method in which PingPong256 combines LFSR and variable clock to generate an irregular PRNG and use it for image encryption. PingPong256 is guaranteed an extended period based on the two LFSRs, and the variable clock is a structure that outputs the result of operating a predetermined clock in one operation by referring to the state of the different LFSR. A variable clock is characterized by the difficulty of predicting the output at any time because the choice increases with time. PingPong256 combines the advantages of LFSR and variable clock, the convenience of hardware and software implementation, and the benefits of sensitivity and irregular periods. Also, the statistical safety was verified using the NIST SP800-22, the safety of the proposed method, and the sensitivity of the image change was tested using NPCR and UACI.
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