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| author | Jay Berkenbilt <ejb@ql.org> | 2012-12-30 03:31:21 +0100 |
|---|---|---|
| committer | Jay Berkenbilt <ejb@ql.org> | 2012-12-31 16:32:32 +0100 |
| commit | e57c25814e49b82863753894ee7d97c18e4c4525 (patch) | |
| tree | 232c2b8501849c5ce9bffc2c6c4bfd861ddd5a42 /TODO | |
| parent | 93ac1695a4b79f3d5b71e2d57ed876c28866d2c9 (diff) | |
| download | qpdf-e57c25814e49b82863753894ee7d97c18e4c4525.tar.zst | |
Support for encryption with /V=5 and /R=5 and /R=6
Read and write support is implemented for /V=5 with /R=5 as well as
/R=6. /R=5 is the deprecated encryption method used by Acrobat IX.
/R=6 is the encryption method used by PDF 2.0 from ISO 32000-2.
Diffstat (limited to 'TODO')
| -rw-r--r-- | TODO | 26 |
1 files changed, 0 insertions, 26 deletions
@@ -1,32 +1,6 @@ General ======= - * See if I can support the encryption format used with /R 5 /V 5 - (AESV3), even though a qpdf-announce subscriber with an adobe.com - email address mentioned that this is deprecated. There is also a - new encryption format coming in a future release (PDF 2.0), which - may be better to support. As of the qpdf 3.0 release, the - specification was not publicly available yet. - - AESV3 encryption is supported with PDF 1.7 extension level 3 and is - being deprecated, but there are plenty of files out there. The - encryption format is decribed in adobe_supplement_iso32000.pdf. - Such a file must specify that it uses these extensions in its - document catalog: - - << - /Type /Catalog - /Extensions << - /ADBE << - /BaseVersion /1.7 - /ExtensionLevel 3 - >> - >> - >> - - Possible sha256 implementations: http://sol-biotech.com/code/sha2/, - http://hashlib2plus.sourceforge.net/ - * Improve the random number seed to make it more secure so that we have stronger random numbers, particularly when multiple files are generated in the same second. This code may need to be |