Microsoft's File Checksum Integrity Verifier utility example
------------------------------------------------------------

[this utility can be found on http://support.microsoft.com/kb/841290]

open a command prompt
go to the directory in which the twelve PDF's are stored

to compute all MD5 and SHA-1 hash values of all PDF documents in the current directory

    fciv -add .\ -type *.pdf -both

this should give as output

    //
    // File Checksum Integrity Verifier version 2.05.
    //
                    MD5                             SHA-1
    -------------------------------------------------------------------------
    3d515dead7aa16560aba3e9df05cbc80 80b5977347e287cd5e0bd647871f220721f43364 .\Al Gore.pdf
    3d515dead7aa16560aba3e9df05cbc80 2f3ea4b3b23ebdf9e5ab94cacd56d68cdbe84bf5 .\Barack Obama.pdf
    3d515dead7aa16560aba3e9df05cbc80 fd5d47343aa11af7627aa026ac79038b59d98cc6 .\Fred Thompson.pdf
    3d515dead7aa16560aba3e9df05cbc80 fbc72f2efd7b08b5bf08c1844e8a2ef183880a2f .\Jeb Bush.pdf
    3d515dead7aa16560aba3e9df05cbc80 5478e89abd69264b95436310f52218e0559741bd .\John Edwards.pdf
    3d515dead7aa16560aba3e9df05cbc80 2e32a0b5d30a59306f02b7b3ed63bbeb787ebdd0 .\John McCain.pdf
    3d515dead7aa16560aba3e9df05cbc80 fcca948e28a26356fec4bf969e28ee05dec8b896 .\Mitt Romney.pdf
    3d515dead7aa16560aba3e9df05cbc80 40842b75b907f98d90acab07ee8b781eafd6ca2f .\Oprah Winfrey.pdf
    3d515dead7aa16560aba3e9df05cbc80 7881c80d758e6de64e05c73b1c9601a46a66dd49 .\Paris Hilton.pdf
    3d515dead7aa16560aba3e9df05cbc80 0d0df29788c99b9e098d55169998f262631657db .\Ralph Nader.pdf
    3d515dead7aa16560aba3e9df05cbc80 581c807105e1bc3e21c58e153b89b4229dad25e7 .\(hidden).pdf
    3d515dead7aa16560aba3e9df05cbc80                 (hidden)                 .\(hidden).pdf

(we have taken the two hidden files out of the alphabetical ordering,
 for E we do provide the SHA-1 hash value).