<div dir="ltr"><div class="gmail_signature"><div>1. Existing XAdES</div><div><br></div><div>The existing XAdES (ETSI TS 101 903 V1.4.2) has four forms and three</div><div>advanced forms.</div><div><br></div><div>Four forms</div><div><br></div><div> Basic Electronic Signature (XAdES-BES)</div><div> Explicit Policy based Electronic Signature (XAdES-EPES)</div><div> Electronic Signature with Validation Data (XAdES-T and XAdES-C).</div><div><br></div><div>Three advanced forms</div><div><br></div><div> Extended signatures with time forms (XAdES-X) </div><div> Extended long electronic signatures with time (XAdES-X-L) </div><div> Archival electronic signatures (XAdES-A)</div><div><br></div><div>Conformant generators must support either XAdES-BES or XAdES-EPES,</div><div>while conformance verifiers must support either XAdES-BES or</div><div>XAdES-EPES. Conformnace requirements on XAdES-T and those on XAdES-C</div><div>are defined, but generators or verifiers are not required to support</div><div>them. Conformance requirements on XAdES-X, XAdES-X-L, or XAdES-A are</div><div>not defined.</div><div><br></div><div>ISO 14533-2(=JIS X5093) defines different conformance requirements.</div><div>One is the support of XAdES-T, and the other is the support of</div><div>XAdES-A.</div><div><br></div><div>2. Upcoming XAdES</div><div><br></div><div>The upcoming XAdES (Draft EN 319 132-1 and Draft EN 319 132-2) </div><div>provides four XAdES baseline signature levels (132-1) and </div><div>some additional levels (in 132-2).</div><div><br></div><div>2.1 Baseline signature levels</div><div><br></div><div>a) B-B (some signed and some unsigned qualifying properties)</div><div><br></div><div>b) B-T (trusted token proving that the signature itself actually</div><div>existed at a certain date and time.)</div><div><br></div><div>c) B-LT (all the material required for validation)</div><div><br></div><div>d) B-LTA (time-stamps that allow validation long time after the generation)</div><div><br></div><div>2.2 Additional levels</div><div><br></div><div>There are:</div><div><br></div><div>XAdES-E-BES</div><div>XAdES-E-EPES</div><div>XAdES-E-T</div><div><br></div><div>XAdES-E-C</div><div>XAdES-E-X</div><div>XAdES-E-X-Long</div><div>XAdES-E-X-L</div><div><br></div><div>XAdES-E-A signatures built on XAdES-E-T</div><div>XAdES-E-A signatures built on XAdES-E-C, XAdES-E-X, XAdES-E-X-Long, and XAdES-E-X-L</div><div><br></div><div>Regards,</div>Makoto</div>
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