How much network overhead does TLS add compared to a non-encrypted connection?

Posted by Daniel Sterling on Stack Overflow See other posts from Stack Overflow or by Daniel Sterling
Published on 2009-10-23T21:02:19Z Indexed on 2010/03/26 15:33 UTC
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tls

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network

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https

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http

(Approximately) how many more bits of data must be transferred over the network during an encrypted connection compared to an unencrypted connection?

IIUC, once the TLS handshake has completed, the number of bits transferred is equal to those transferred during an unencrypted connection. Is this accurate?

As a follow up, is transferring a large file over https significantly slower than transferring that file over http, given fast processors and the same (ideal) network conditions?

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