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Asymmetric encryption expands on symmetric encryption by incorporating two different types of keys into the encryption method: private and public keys. [20] A public key can be accessed by anyone and is unique to one user whereas a private key is a secret key that is unique to and only known by one user. [21]
To obtain a public key for the user, the WebAuthn Relying Party initiates a WebAuthn registration flow [21] that is similar to the authentication flow illustrated above. The primary difference is that the authenticator now signs an attestation statement with its attestation private key.
DPAPI doesn't store any persistent data for itself; instead, it simply receives plaintext and returns ciphertext (or conversely).. DPAPI security relies upon the Windows operating system's ability to protect the master key and RSA private keys from compromise, which in most attack scenarios is most highly reliant on the security of the end user's credentials.
The client sends a CertificateVerify message, which is a signature over the previous handshake messages using the client's certificate's private key. This signature can be verified by using the client's certificate's public key. This lets the server know that the client has access to the private key of the certificate and thus owns the certificate.
When using the PKCS #10 format, the request must be self-signed using the applicant's private key, which provides proof-of-possession of the private key but limits the use of this format to keys that can be used for (some form of) signing. The CSR should be accompanied by a proof of origin (i.e., proof of identity of the applicant) that is ...
Re-Key, Re-Key-Key-Pair: creating a new key that can replace an existing key. There are also attributes that can be used to have the server automatically rotate keys after a given period or number of uses. The Name is moved to the new key and is normally used to retrieve a key for protection operations such as encrypt and sign.
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Usually, Transport Layer Security (TLS) uses public key certificates or Kerberos for authentication. TLS-PSK uses symmetric keys, shared in advance among the communicating parties, to establish a TLS connection. There are several reasons to use PSKs: Using pre-shared keys can, depending on the ciphersuite, avoid the need for public key operations.