This paper presents an overview of Chaffing and Winnowing as described by Ronald Rivest. This leads onto a review of a secure Chaffing and Winnowing scheme called Chaffinch. Chaffing and Winnowing introduces a novel new concept that does not use encryption keys, and as such would not be subject to import and export restrictions. Chaffing and Winnowing achieves privacy and confidentiality by using authentication keys, however, these are not to be confused with encryption keys. Authentication keys/digital signatures are not controlled by governments and most have chosen that the disclosure of these signatures is not allowed. They have taken this stance over authentication keys because of the danger of unscrupulous people being able to use someone else's personal authenticator to take over that person's identity!
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