reading text and doc file with same contents produces different MD5 hash value

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Hi,

why does a text, doc or pdf file having same contents produces different hash result. in my application, i want to compute hash value of files having same contents but different files extension using mdf algorithm . although having contents same, mdf algorithm is producing different hash code, whereas it should produce same hash code. fyi. i am using binaryreader for reading files. I also tried with streamreader but still same.

appreciate your response.

Posted 2-Aug-12 3:55am

deepak_2012

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Kenneth Haugland 2-Aug-12 9:59am

They may store the same values differently, I can take a picture of the document, but it does not have the same hash code as the text document :)

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OriginalGriff · Accepted Answer · 2012-08-02T04:09:00

Solution 1

Because they don't have the same contents.
They may contain the same text, but the text element is not the only information in a DOC or PDF file, where it is the only info in a TXT file. DOCs and PDFs (and most other file formats) add "packing" information like font, size, boldness, location, etc., etc.

Posted 2-Aug-12 4:09am

OriginalGriff

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tiggerc 3-Aug-12 2:53am

Well answered that programmer.