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Asymmetric cryptography, or public-key cryptography, is the foundation of security protocols that do not require shared secrets.

1
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If I understand your question correctly, I'm not sure if the existing answers really address it. It seems you may be wondering where the anti-symmetry fundamentally comes from. If so, I'll try to …
answered May 7 '17 by Mehrdad
26
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No, unless you use a unique one per service. It lets attackers identify you. If you use the same public key for service A and service B, and your public key gets leaked for both of them, this will cr …
answered Feb 7 '17 by Mehrdad