Overhead of TLS/SSL on a TCP socket connection?

Posted by TK Kocheran on Server Fault See other posts from Server Fault or by TK Kocheran
Published on 2011-03-18T21:38:59Z Indexed on 2011/03/19 0:12 UTC
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ssl

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tcp

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tls

Is there any bandwidth overhead on using SSL on a TCP connection? I understand, of course, the processing/memory usage overhead in encrypting and decrypting packets, but as far as bandwidth is concerned, what is the difference, if any?

For example, given a XML file which is 64KB, will there be any tangible difference in the transfer size of the file over HTTP vs. HTTPS? (Ignoring mod_deflate and mod_gzip, of course)

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