Narrow Bandwidth Is Not Inherent in Reverse Public-Key Encryption
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- Naccache D., Steinwandt R., Suárez Corona A., Yung M. (2014) Narrow Bandwidth Is Not Inherent in Reverse Public-Key Encryption. In: Abdalla M., De Prisco R. (eds) Security and Cryptography for Networks. SCN 2014. Lecture Notes in Computer Science, vol 8642. Springer, Cham
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.
Keywordspublic-key encryption mode of operation reverse public-key encryption broadcast encryption
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