>Is https enough to mostly protect the transmission of credit card data?


Very tricky question.  Is HTTP enough for CC use. Yes. No doubt in my mind.
https secures the channel that the CC num and details are passed through.
The REAL security question, is what happens with that CC after it passes
securely.  Is it stored on an exposed database?  Is the CC emailed to
somebody? 

That's actually why I don't store CCs.  I run the transaction, let the CC
portal (authorize.net) track the CC and I keep the last 6 digits.  Enough
for our records, not enough to be of value if stolen.

Hope that helps

mj/v


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