Adaptive Witness Encryption and Asymmetric Password-Based Cryptography

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Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
In this paper the authors defines Adaptive Soundness (AS) security for witness encryption and applies it to provide the first non-invasive schemes for Asymmetric Password-Based Encryption (A-PBE). A-PBE offers significant gains over classical, Symmetric Password-Based Encryption (S-PBE) in the face of attacks that compromise servers to recover hashed passwords. The authors also show by counter-example that the original Soundness Security (SS) requirement of GGSW does not suffice for the security of their own applications, and show that AS fills the gap.
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