The first rule of security is: you do not invent security protocols.
The second rule of security is: you do not invent security protocols!
The third rule of security is: if this is your first time with security you do not invent security protocols.
Inventing, modifying, tweaking, hacking, extending, optimizing, or just about anything else you can do to a cryptographic protocol, hash, algorithm, PRNG, key agreement, or cryptographic technique is a very bad idea.
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