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TABLE 313 Entries common to all encryption dictionaries
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KEY TYPE VALUE
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(Required) The name of the security handler for this document; see below Default value: Standard, for the built-in security handler (Names for other security handlers can be registered using the procedure described in Appendix E) (Optional but strongly recommended) A code specifying the algorithm to be used in encrypting and decrypting the document: 0 1 2 3 An algorithm that is undocumented and no longer supported, and whose use is strongly discouraged Algorithm 31 on page 73, with an encryption key length of 40 bits; see below (PDF 14) Algorithm 31 on page 73, but allowing encryption key lengths greater than 40 bits (PDF 14) An unpublished algorithm allowing encryption key lengths ranging from 40 to 128 bits (This algorithm is unpublished as an export requirement of the US Department of Commerce)
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The default value if this entry is omitted is 0, but a value of 1 or greater is strongly recommended (See implementation note 15 in Appendix H)
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Length
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(Optional; PDF 14; only if V is 2 or 3) The length of the encryption key, in bits The value must be a multiple of 8, in the range 40 to 128 Default value: 40
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Unlike strings within the body of the document, those in the encryption dictionary must be direct objects and are not encrypted by the usual methods The security handler itself is responsible for encrypting and decrypting strings in the encryption dictionary, using whatever encryption algorithm it chooses Note: Document creators have two choices if the standard security handler and encryption methods provided by PDF are not suf cient for their needs: they can provide an alternate, more secure security handler or they can encrypt whole PDF documents themselves, not making use of PDF security
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351 General Encryption Algorithm
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PDF s standard encryption methods use the MD5 message-digest algorithm (described in Internet RFC 1321, The MD5 Message-Digest Algorithm; see the Bibliography) and a proprietary encryption algorithm known as RC4 RC4 is a
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symmetric stream cipher: the same algorithm is used for both encryption and decryption, and the algorithm does not change the length of the data Note: RC4 is a copyrighted, proprietary algorithm of RSA Security, Inc Adobe Systems has licensed this algorithm for use in its Acrobat products Independent software vendors may be required to license RC4 in order to develop software that encrypts or decrypts PDF documents For further information, visit the RSA Web site at <http://wwwrsasecuritycom> or send e-mail to <products@rsasecuritycom> The encryption of data in a PDF le is based on the use of an encryption key computed by the security handler Different security handlers can compute the encryption key in a variety of ways, more or less cryptographically secure Regardless of how the key is computed, its use in the encryption of data is always the same (see Algorithm 31) Because the RC4 algorithm is symmetric, this same sequence of steps can be used both to encrypt and to decrypt data
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Algorithm 31 Encryption of data using an encryption key
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Obtain the object number and generation number from the object identi er of the string or stream to be encrypted (see Section 329, Indirect Objects ) If the string is a direct object, use the identi er of the indirect object containing it Treating the object number and generation number as binary integers, extend the original n-byte encryption key to n + 5 bytes by appending the low-order 3 bytes of the object number and the low-order 2 bytes of the generation number in that order, low-order byte rst (n is 5 unless the value of V in the encryption dictionary is greater than 1, in which case n is the value of Length divided by 8) Initialize the MD5 hash function and pass the result of step 2 as input to this function Use the rst (n + 5) bytes, up to a maximum of 16, of the output from the MD5 hash as the key for the RC4 encryption function, along with the string or stream data to be encrypted The output is the encrypted data to be stored in the PDF le
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3 4
Stream data is encrypted after applying all stream encoding lters, and is decrypted before applying any stream decoding lters; the number of bytes to be encrypted or decrypted is given by the Length entry in the stream dictionary Decryption of strings (other than those in the encryption dictionary) is done after escape-sequence processing and hexadecimal decoding as appropriate to the string representation described in Section 323, String Objects