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Narrow bandwidth is not inherent in reverse public-key encryption. (English) Zbl 1378.94057

Abdalla, Michel (ed.) et al., Security and cryptography for networks. 9th international conference, SCN 2014, Amalfi, Italy, September 3–5, 2014. Proceedings. Berlin: Springer (ISBN 978-3-319-10878-0/pbk). Lecture Notes in Computer Science 8642, 598-607 (2014).
Summary: Reverse public-key encryption (RPKE) is a mode of operation exploiting a weak form of key privacy to provide message privacy. In principle, RPKE offers a fallback mode, if the underlying encryption scheme’s message secrecy fails while a weak form of key privacy survives. To date, all published RPKE constructions suffer from a low bandwidth, and low bandwidth seems naturally inherent to reverse encryption. We show how reverse encryption can, in connection with and as a novel application of anonymous broadcast encryption, achieve high-bandwidth. We point out that by using traditional and reverse encryption simultaneously, a form of crypto-steganographic channel inside a cryptosystem can be provided.
For the entire collection see [Zbl 1296.94004].

MSC:

94A60 Cryptography
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