Difference between pages "SHA-1" and "Virtual Hard Disk (VHD)"

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(clarify FIPS)
 
(Image types)
 
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'''SHA-1''' ('''S'''ecure '''H'''ash '''A'''lgorithm) is a cryptographic hash function that was first published in 1995 in Federal Information Processing Standards (FIPS) PUB 180-1 by the National Security Agency (NSA) as a fix to an unknown flaw found in SHA-0.
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{{expand}}
  
In February of 2005 an attack was announced that could find collisions in SHA-1 requiring fewer than 2<sup>69</sup> operations.
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== Image types ==
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There are multiple types of Virtual Hard Disk (VHD) images:
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* Fixed-size hard disk image
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* Dynamic-size (or sparse) hard disk image
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* Differencing (or delta) hard disk image
  
== Tools ==
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== External Links ==
  
On most Unix systems the tool sha1sum can be used to compute the SHA-1 hash of a file or devices.
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* [http://en.wikipedia.org/wiki/VHD_(file_format) VHD (file format)], by Wikipedia
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* [http://technet.microsoft.com/en-us/library/bb676673.aspx Virtual Hard Disk Image Format Specification], by Microsoft
  
== External Links ==
 
* [ftp://ftp.rfc-editor.org/in-notes/rfc3174.txt RFC 3174]
 
  
[[Category:Hashing]]
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[[Category:File Formats]]

Revision as of 04:01, 13 September 2012

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Image types

There are multiple types of Virtual Hard Disk (VHD) images:

  • Fixed-size hard disk image
  • Dynamic-size (or sparse) hard disk image
  • Differencing (or delta) hard disk image

External Links