[Cryptography] Cycles overhead for TLS

[Ryan Carboni]

I'm not sure so these are rough guesses, but:

5 cycles per byte for TCP overhead.
100,000 cycles for ECC key exchange.
Several thousand cycles for PRF key generation.
10 to 1 cycles per byte for symmetric crypto
Average webpage size is 1 megabyte, so maybe average TLS connection
eventually transfers 15 megabytes.

I think any performance improvements in asymmetric and symmetric
cryptography would be minor compared to TCP overhead.
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