ABB SC510 3BSE003832R1 module
Technical data of product parameters
Each crypt filter specified in the CF entry of the encryption dictionary is represented by a crypt filter dictionary, whose entries are shown in Table 3.22.
• A stream filter type, the Crypt filter (see Section 3.3.9, “Crypt Filter”) can be
specified for any stream in the document to override the default filter for
streams. A standard Identity filter is provided (see Table 3.23) to allow specific
streams, such as document metadata, to be unencrypted in an otherwise encrypted document. The stream’s DecodeParms entry must contain a Crypt filter
decode parameters dictionary (see Table 3.12) whose Name entry specifies the
particular crypt filter to be used (if missing, Identity is used). Different streams
may specify different crypt filters; however, see implementation notes 28 and
29 in Appendix H.
Authorization to decrypt a stream must always be obtained before the stream canSC510 3BSE003832R1
be accessed. This typically occurs when the document is opened, as specified by a
value of DocOpen for the AuthEvent entry in the crypt filter dictionary. PDF
consumer applications and security handlers should treat any attempt to access a
stream for which authorization has failed as an error. AuthEvent may also be
EFOpen, which indicates the presence of an embedded file that is encrypted with
a crypt filter that may be different from the crypt filters used by default to encryptSC510 3BSE003832R1
strings and streams in the document; see implementation note 31 in Appendix H.
By specifying a value of None for the CFM entry in the crypt filter dictionary, theSC510 3BSE003832R1
security handler can do its own decryption. This allows the handler to tightly
control key management and use any preferred symmetric-key cryptographic
algorithm.
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