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Why does the YubiKey use symmetric encryption? Why not public key cryptography or even PKI?

April 26, 2017cryptography encryption key PKI public Symmetric yubikey

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Why does the YubiKey use symmetric encryption? Why not public key cryptography or even PKI?

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Simplicity. Public key and associated infrastructures add complexity in key lifecycle management. Also, because in most applications, the service provider is a trusted partner, there is no need for third party verification.