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Object encryption key calculation

Document encryption key

http://www.elcomsoft.com

Object ID + Generation

MD5

HASH

algorithm

Object encryption key

Document encryption key

ScrambledObject ID + Generation

MD5

HASH

algorithm

Object encryption key

‘sAlT’ string

Algorithm ver.1,2

Algorithm ver.3

Related Internet resources:

http://www.adobe.com/products/acrobat/adobepdf.html

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