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• W2784812226 abstract "While symmetric-key steganography is quite well understood both in the information-theoretic and in the computational setting, many fundamental questions about its public-key counterpart resist persistent attempts to solve them. The computational model for public-key steganography was proposed by von Ahn and Hopper in EUROCRYPT 2004. At TCC 2005, Backes and Cachin gave the first universal public-key stegosystem – i.e. one that works on all channels – achieving security against replayable chosen-covertext attacks (ss-rcca) and asked whether security against non-replayable chosen-covertext attacks (ss-cca) is achievable. Later, Hopper (ICALP 2005) provided such a stegosystem for every efficiently sampleable channel, but did not achieve universality. He posed the question whether universality and ss-cca-security can be achieved simultaneously. No progress on this question has been achieved since more than a decade. In our work we solve Hopper’s problem in a somehow complete manner: As our main positive result we design an ss-cca-secure stegosystem that works for every memoryless channel. On the other hand, we prove that this result is the best possible in the context of universal steganography. We provide a family of 0-memoryless channels – where the already sent documents have only marginal influence on the current distribution – and prove that no ss-cca-secure steganography for this family exists in the standard non-look-ahead model." @default.
• W2784812226 created "2018-02-02" @default.
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• W2784812226 date "2018-01-01" @default.
• W2784812226 modified "2023-09-27" @default.
• W2784812226 title "On the Gold Standard for Security of Universal Steganography" @default.
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• W2784812226 doi "https://doi.org/10.1007/978-3-319-78381-9_2" @default.
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