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Article overview
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Concurrent Knowledge-Extraction in the Public-Key Model | | Andrew C. Yao
; Moti Yung
; Yunlei Zhao
; | | Date: |
18 Aug 2009 | | Abstract: | Knowledge extraction is a fundamental notion, modelling machine possession of
values (witnesses) in a computational complexity sense. The notion provides an
essential tool for cryptographic protocol design and analysis, enabling one to
argue about the internal state of protocol players without ever looking at this
supposedly secret state. However, when transactions are concurrent (e.g., over
the Internet) with players possessing public-keys (as is common in
cryptography), assuring that entities ’’know’’ what they claim to know, where
adversaries may be well coordinated across different transactions, turns out to
be much more subtle and in need of re-examination. Here, we investigate how to
formally treat knowledge possession by parties (with registered public-keys)
interacting over the Internet. Stated more technically, we look into the
relative power of the notion of ’’concurrent knowledge-extraction’’ (CKE) in
the concurrent zero-knowledge (CZK) bare public-key (BPK) model. | | Source: | arXiv, 0908.2476 | | Services: | Forum | Review | PDF | Favorites | |
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