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Crypto/pre-shared keys to crypto/pki worth doing?

Hi,

I have 10 VPN's that come into my ASA 5520, they all use pre-shared keys (and AES-256/sha), is it worth moving to pki instead?

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Re: Crypto/pre-shared keys to crypto/pki worth doing?

PKI provides customers with a scalable, secure mechanism for distributing, managing, and revoking encryption and identity information in a secured data network. Every entity (a person or a device) participating in the secured communications is enrolled in the PKI , a process where the entity generates a Rivest, Shamir, and Adelman (RSA) key pair (one private key and one public key) and has their identity validated by a trusted entity (also known as a CA or trustpoint).

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