PDF Version 1.4 Encryption Standard 1.2

[tomek]

Quick question:
When exiftool reports PDF Version 1.4 Encryption Standard 1.2 - is this 40-bit or 128-bit encryption? Please advise. Here is full output:
>exiftool b.pdf
ExifTool Version Number         : 7.76
File Name                       : b.pdf
Directory                       : .
File Size                       : 349 kB
File Modification Date/Time     : 2011:03:10 11:10:07-05:00
File Type                       : PDF
MIME Type                       : application/pdf
PDF Version                     : 1.4
Encryption                      : Standard v1.2
Warning                         : Document is password encrypted

[Phil Harvey]

First, you should update your ExifTool version.  Support for AES-128 and AES-256 encryption and the ability to specify passwords was added in version 8.35.

But to answer your question, version 1 is 40-bit encryption.

- Phil

Edit: I'll add the bit length to the value of the extracted "Encryption" tag in ExifTool 8.51.

[tomek]

Thanks for your quick reply!

Tomek