Levels of the existing and upcoming versions of XAdES

[MURATA Makoto]

1. Existing XAdES

The existing XAdES (ETSI TS 101 903 V1.4.2) has four forms and three
advanced forms.

Four forms

    Basic Electronic Signature (XAdES-BES)
    Explicit Policy based Electronic Signature (XAdES-EPES)
    Electronic Signature with Validation Data (XAdES-T and XAdES-C).

Three advanced forms

    Extended signatures with time forms (XAdES-X)
    Extended long electronic signatures with time (XAdES-X-L)
    Archival electronic signatures (XAdES-A)

Conformant generators must support either XAdES-BES or XAdES-EPES,
while conformance verifiers must support either XAdES-BES or
XAdES-EPES.  Conformnace requirements on XAdES-T and those on XAdES-C
are defined, but generators or verifiers are not required to support
them.  Conformance requirements on XAdES-X, XAdES-X-L, or XAdES-A are
not defined.

ISO 14533-2(=JIS X5093) defines different conformance requirements.
One is the support of XAdES-T, and the other is the support of
XAdES-A.

2. Upcoming XAdES

The upcoming XAdES (Draft EN 319 132-1 and Draft EN 319 132-2)
provides four XAdES baseline signature levels (132-1) and
some additional levels (in 132-2).

2.1 Baseline signature levels

a) B-B (some signed and some unsigned qualifying properties)

b) B-T (trusted token proving that the signature itself actually
existed at a certain date and time.)

c) B-LT (all the material required for validation)

d) B-LTA (time-stamps that allow validation long time after the generation)

2.2 Additional  levels

There are:

XAdES-E-BES
XAdES-E-EPES
XAdES-E-T

XAdES-E-C
XAdES-E-X
XAdES-E-X-Long
XAdES-E-X-L

XAdES-E-A signatures built on XAdES-E-T
XAdES-E-A signatures built on XAdES-E-C, XAdES-E-X, XAdES-E-X-Long, and
XAdES-E-X-L

Regards,
Makoto
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