Moving a 13 gig file over sFTP (md5sum fails)

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http://serverfault.com – Each time I download a big file over sftp, the md5sum on the source machine doesn't match the md5sum I do on the destination machine. I have a 13gig file on an Ubuntu 12.04 machine with openssh-server running. I used FileZilla to download that file to my laptop over sftp. However, the file isn't exactly the same after the download completes. Perhaps the FTP protocol isn't the best choice? Without an external hard-drive handy, what the most certain way I can transfer this file and be certain that the copy I get is exact? (HowTos)