Difference between pages "MD5" and "Pdfinfo"

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The '''Message-Digest algorithm 5''' ('''MD5''') is a cryptographic [[hash|hash function]] that produces a 128-bit hash value. Originally developed in 1991, much as has been written about this algorithm. As such, this article concentrates only on its application to computer forensics.
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{{Infobox_Software |
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  name = pdfinfo |
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  maintainer = [[Foo labs]] |
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  os = {{Cross-platform}} |
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  genre = {{Metadata}} |
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  license = {{GPL}} |
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  website = [http://www.foolabs.com/xpdf/ foolabs.com/xpdf/] |
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}}
  
== Tools ==
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'''pdfinfo''' is a small utility which shows (parts of) the metadata stored in [[PDF]] files. It is part of the [[xpdf]] package.
  
On most [[Unix]] systems the tools [[digest]] -a md5 (Solaris), [[md5]] (BSD) or [[md5sum]] (GNU) can be used to compute the MD5 hash of a file or device. [[md5deep]] can compute MD5 hashes of whole directory trees.
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== Example ==
  
== Weaknesses ==
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$ pdfinfo nsa-redact.pdf
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Title:          Redacting with Confidence:  How to Safely Publish Sanitized Reports Converted from Word to PDF
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Subject:        I333-015R-2005
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Keywords:      word, pdf, redaction, metadata
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Author:        SNAC
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Creator:        activePDF DocConverter
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Producer:      5D PDFLib
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CreationDate:  Tue Jan 10 11:15:26 2006
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ModDate:        Fri Jan 20 09:05:43 2006
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Tagged:        no
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Pages:          14
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Encrypted:      no
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Page size:      612 x 792 pts (letter)
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File size:      681417 bytes
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Optimized:      yes
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PDF version:    1.3
  
Recently some cryptographic weaknesses have been found in MD5. Tool developers should avoid using MD5 in new products in favor of other hash functions like [[RIPEMD-160]], [[Tiger]], [[WHIRLPOOL]], [[SHA-256]] or [[SHA-512]]. Host Intrusion Detection systems and hash databases should also use multiple hash algorithms.
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The <tt>-meta</tt> command line option shows some more metadata (in [[XML]] format).
 
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== External Links ==
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* [http://en.wikipedia.org/wiki/Md5 Wikipedia: MD5]
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* [http://deepbyte.com/blog/2006/02/is_the_md5_hash_unreliable.html Is the MD5 hash unreliable?]
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* [http://unixsadm.blogspot.com/2007/11/exploiting-md5-and-other-hashing.html Collection of exploits and weaknesses in MD5]
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[[Category:Hashing]]
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Latest revision as of 11:37, 6 May 2006

pdfinfo
Maintainer: Foo labs
OS: Cross-platform
Genre: Metadata
License: GPL
Website: foolabs.com/xpdf/

pdfinfo is a small utility which shows (parts of) the metadata stored in PDF files. It is part of the xpdf package.

Example

$ pdfinfo nsa-redact.pdf
Title:          Redacting with Confidence:  How to Safely Publish Sanitized Reports Converted from Word to PDF
Subject:        I333-015R-2005
Keywords:       word, pdf, redaction, metadata
Author:         SNAC
Creator:        activePDF DocConverter
Producer:       5D PDFLib
CreationDate:   Tue Jan 10 11:15:26 2006
ModDate:        Fri Jan 20 09:05:43 2006
Tagged:         no
Pages:          14
Encrypted:      no
Page size:      612 x 792 pts (letter)
File size:      681417 bytes
Optimized:      yes
PDF version:    1.3

The -meta command line option shows some more metadata (in XML format).