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Cryptanalyzing an Image Encryption Algorithm Based on Autoblocking and Electrocardiography

Li, Chengqing ; Lin, Dongdong ; Lu, Jinhu ; Hao, Feng

IEEE multimedia, 2018-10, Vol.25 (4), p.46-56 [Periódico revisado por pares]

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Título:
Cryptanalyzing an Image Encryption Algorithm Based on Autoblocking and Electrocardiography
Autor: Li, Chengqing ; Lin, Dongdong ; Lu, Jinhu ; Hao, Feng
Assuntos: Algorithms ; Chaos theory ; Chaotic communication ; Cryptography ; Data encryption ; Electrocardiography ; Encryption ; Feature extraction ; Logistics ; Security
É parte de: IEEE multimedia, 2018-10, Vol.25 (4), p.46-56
Descrição: This paper performs a thorough security analysis of a chaotic image encryption algorithm based on autoblocking and electrocardiography from the view point of modern cryptography. The algorithm uses electrocardiography (ECG) signals to generate the initial key for a chaotic system and applies an autoblocking method to divide a plain image into blocks of certain sizes suitable for subsequent encryption. The designers claimed that the proposed algorithm is “strong and flexible enough for practical applications”. We find it is vulnerable to the known plaintext attack: based on one pair of a known plain-image and its corresponding cipher-image, an adversary is able to derive a mask image, which can be used as an equivalent secret key to successfully decrypt other cipher images encrypted under the same key with a non-negligible probability of 1/256. Using this as a typical counterexample, we summarize some security defects existing in many image encryption algorithms.
Editor: New York: IEEE
Idioma: Inglês

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