Chinese WAPI protocol?

> unpublished cryptographic algorithms.  The
specification is secret
> and confidential.  It uses the SMS4 block cipher, which
is secret and
> patented. [*]

It's been declassified in January 2006.
The SMS4 cipher specification -
http://www.oscca.gov.cn/UpFile/200621016423197990.pdf

Ruptor

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