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<div class="titlepage"><div><div><h2 class="title">
<a name="overview"></a>GEIER Overview</h2></div></div></div>
<p>
GEIER is the first free library to encrypt, digitally sign, decrypt,
validate and send gathered tax declarations data to the
German inland revenue offices.
Furthermore it allows to generate XHTML transmission protocols using
XSLT mechanisms.
</p>
<p>
GEIER is short for <span class="emphasis"><em>GPL'd Elster Interface</em></span> and
part of the Taxbird project.
</p>
<p>
GEIER uses the COALA interface supplied by the German inland revenue
offices. COALA is a publicly documented transmission interface,
which heavily relies on XML. The data is transmitted compressed with
GZIP and symmetrically encrypted with a 3DES key. The 3DES key, which
is generated by the GEIER library, is sent to the Elster servers
after it has been asymmetrically encrypted using the RSA algorithm.
For the actual transmission HTTP/Post is utilized.
</p>
<p>
Besides plain transmission GEIER is capable of digitally signing the
Elster XML-documents using software certificates (X.509 based).
The latter approach is called <span class="emphasis"><em>Elster Basis</em></span> by
the fiscal authorities.
</p>
<p>
Please mind, that GEIER heavily relies on Mozilla (xulrunner) NSS.
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