Fast Secure way to upload data into Amazon S3

We want to upload data in a secure way from our datacentre, which is a bank to Amazon s3.
Fast way - Tsunami UDP (It seems that UDP protocols are much faster compared to tcp protocals like scp,ftp etc). However, Tsunami UDP cant directly stream into s3, but I can across this post with http://ift.tt/1Bk1Azk. This plugin seems to be able to do so.
Any other recommendations here

Secure - Amazon Direct Connect might have added costs so not considering for the initial phase. Amazon Import/Export - This might only be feasible for the first time upload.
Any recommendations here to create a secure channel between aws and the datacentre