![]() The recipient decrypts the encrypted one time use encryption key with their private key and the one time use encryption key is then used to decrypt the file. The encrypted file and encrypted one time use encryption key is sent to the recipient. The recipient’s public key is extracted from their certificate and used to encrypt the one time use encryption key. The encryption application creates a one time use encryption key which is used to encrypt the file. Once a certificate has been issued it can be used for file and email encryption. The private key and certificates are managed on the local computer by the Certificates utility. The certificate is trusted because it has been signed by the CA. A certificate is the user’s public key which has been signed by the CA. If the CSR is accepted by the CA it will create and issue a certificate for the user. When a user wants to use PKI for encryption they use a utility such as Microsoft Windows’ Certificates to generate a private key and a certificate signing request(CSR). The CA is responsible for issuing public-key certificates, or simply “certificates”, for users. To ensure that you trust the certificates issued by the CA you may have to add the CA’s root certificate into the Trusted Root Certification Authorities node of your Certificate utility. Then the central piece of the infrastructure is called the certificate authority (CA). If signed, the recipient can confirm the sender’s signature with a copy of the sender’s public key.The recipient decrypts the one time use encryption key and then uses the one time use encryption key to decrypt the encrypted file. ![]()
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