!!! Overview
[{$pagename}] are [Digital Signature] schemes for allowing a member of a group to [anonymously|anonymity] sign a [message] on behalf of the group.

The concept was first introduced by David Chaum and Eugene van Heyst in [1991|Year 1991]. 


For [example], a [{$pagename}] scheme could be used by an [employee] of a large company where it is sufficient for a verifier to know a message was signed by an employee, but not which particular employee signed it. 

Another application is for [keycard|Smart Card] access to restricted areas where it is inappropriate to track individual employee's movements, but necessary to secure areas to only employees in the group.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Group_signature|Wikipedia:Group_signature|target='_blank'] - based on information obtained 2017-10-28-