S3 encrypted upload script, v2 (Python)

Ok, so I discovered a number of shortcomings in my recent attempt to sync a folder in one direction to Amazon S3 using encryption, the most important of which was that it wouldn’t resume a failed transfer efficiently, which in the case of large transfers wasn’t at all ideal (as I learned to be own cost - damn my 256k upload speed). So, this is attempt number 2. I decided to completely rewrite the script in Python instead to give me some more flexibility, coupled with the availability of Boto, a nice Python library for accessing all the Amazon Web Services.

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