A little while ago for the first time compared the SHA1 checksum of a downloaded file...

When downloading software from the internet for a long time since 2006 I have seen and wondered what is this MD5 or SHA1 means...It is written as checksum...Tonight about one and half hour ago I read wikipedia ( before also I had read it a few times regarding this ) and learnt what it meant...It a cryptoanalysis key designed by the American National Security Agency...To make sure the files downloaded from the internet one has to compare this Secure Hash Algorithm 1 ( SHA1 ) or MD5 of the downloaded file to the given SHA1 or MD5 key in the website of the file been downloaded....Alhamdhu Lilaahi Rabil Aalmeen....Praise be to Allah lord of the worlds...........I just now did it using the free command line tool provided by Microsoft and it is called the Microsoft File Checksum Integrity Verifier....I downloaded the PHP5 distribution to test and learn this....Here is the photos I took from my Samsung Galaxy S3 Mini Android phone....