CHAPTER 8
730
Interactive Features
TABLE 8.103 Entries in a signature reference dictionary
KEY
TYPE
VALUE
Type
name
name
(Optional)
The type of PDF object that this dictionary describes; if
present, must be
SigRef
for a signature reference dictionary.
(Required)
The name of the transform method (see Section 8.7.1,
modification analysis that takes place when the signature is validat-
ed. Valid values are:
DocMDP
TransformMethod
Used to detect modifications to a document relative
to a signature field that is signed by the originator of
a document; see “DocMDP” on page 731.
Used to detect modifications to a document that
would invalidate a signature in a rights-enabled doc-
ument; see “UR” on page 733.
Used to detect modifications to a list of form fields
specified in
TransformParams
; see “FieldMDP” on
Used when signing a single object, which is specified
by the value of
Data
in the signature reference dic-
tionary (see Table 8.103). This transform method
supports signing of FDF files. See “Identity” on page
UR
FieldMDP
Identity
TransformParams
dictionary
(Optional)
A dictionary specifying transform parameters (variable
data) for the transform method specified by
TransformMethod
.
Each method except
Identity
takes its own set of parameters. See
each of the sections specified above for details on the individual
transform parameter dictionaries
(Required when
TransformMethod
is
FieldMDP
or
Identity
)
An indi-
rect reference to the object in the document over which the digest
was computed or upon which the object modification analysis
should be performed. For transform methods other than
FieldMDP
and
Identity
, this object is implicitly defined.
(Optional)
A name identifying the algorithm to be used when com-
puting the digest. Valid values are
MD5
and
SHA1
. (See implemen-
MD5
.
Data
(various)
DigestMethod
name