On the Security of Bitstream-level JPEG Encryption with Restart Markers

• URL: http://arxiv.org/abs/2410.06522v1
• Date: Wed, 9 Oct 2024 03:50:31 GMT
• Title: On the Security of Bitstream-level JPEG Encryption with Restart Markers
• Authors: Mare Hirose, Shoko Imaizumi, Hitoshi Kiya,
• Abstract summary: This paper aims to evaluate the security of a bitstream-level JPEG encryption method using restart (RST) markers. The security of the method was evaluated only with respect to the key space analysis for brute-force attacks. In experiments, the method is confirmed to be robust against ciphertext-only attacks if parameters used for image encryption are carefully chosen.
• Score: 5.311735227179715
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: This paper aims to evaluate the security of a bitstream-level JPEG encryption method using restart (RST) markers, where encrypted image can keep the JPEG file format with the same file size as non-encrypted image. Data encrypted using this method can be decoded without altering header information by employing a standard JPEG decoder. Moreover, the use of RST markers enables the definition of extended blocks divided by the markers, so spatially partial encryption and block-permutation-based encryption can be carried out. However, the security of the method was evaluated only with respect to the key space analysis for brute-force attacks and other limited attacks. Accordingly, in this paper, we evaluated the security of the method with respect to robustness against ciphertext-only attacks including state-of-the-art attacks. In experiments, the method is compared with conventional encryption methods, and it is confirmed to be robust against ciphertext-only attacks if parameters used for image encryption are carefully chosen.

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