The SHA-1 algorithm is the brainchild of the US-based National Security Agency (NSA)
Basically it works the same as the MD5, a SHA-1 file is available on the download server where you downloaded your ISOs and when opening it you will see a string of numbers that you compare to the output of the command:
CODE: $ sha1sum /home/Nikesh/downloaded.iso
The string you get from this command typically looks like:
QUOTE
f560f26a32820143e8286afb188f7c36d905a735
You compare it to the string you find in the SHA-1 file on the download server. If both of them are identical you can be sure your downloaded ISO is okay and you can burn it to a CD.
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source:http://linuxpoison.blogspot.com/2008/04/135781758012247.html