FOXBORO FBMSSW Foxboro controller module

FOXBORO FBMSSW Foxboro controller module

Technical data of product parameters

EmbeddedFBMSSW files specified in the FDF dictionary’s EmbeddedFDFs entry may
optionally be encrypted. Besides the usual entries for an embedded file stream,
the stream dictionary representing such an encrypted FDF file must contain the
additional entry shown in Table 8.94 to identify the revision number of the FDF
encryption algorithm used to encrypt the file. Although the FDF encryption
mechanism is separate from the one for PDF file encryption described in Section
3.5, “Encryption,” revision 1 (the only one defined at the time of publication) uses FBMSSW
a similar RC4 encryption algorithm based on a 40-bit encryption key. The key is
computed by means of an MD5 hash, using a padded user-supplied password as FBMSSW
input. The computation is identical to steps 1 and 2 of Algorithm 3.2 on page 125;
the first 5 bytes of the result are the encryption key for the embedded FDF file. Each field in an FDF file is described by an FDF field dictionary. Table 8.96 shows
the contents of this type of dictionary. Most of the entries have the same form and
meaning as the corresponding entries in a field dictionary (Table 8.69 on page
675, Table 8.71 on page 678, Table 8.78 on page 692, and Table 8.80 on page 694)
or a widget annotation dictionary (Table 8.15 on page 606 and Table 8.39 on page FBMSSW
641). Unless otherwise indicated in the table, importing a field causes the values
of the entries in the FDF field dictionary to replace those of the corresponding
entries in the field with the same fully qualified name in the target document.
(See implementation notes 130–135 in Appendix H.)

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