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VMware use standard X.509 version 3 certificates to encrypt session information sent over Secure Socket Layer protocol connections between the client and the server. If you want to replace default certificates for vCenter Server and ESXi , the certificates you obtain for your servers must be signed and must conform to the Privacy Enhanced Mail (PEM) key format. The key used to sign certificates must be a standard RSA key with an encryption length that ranges from 512 to 4,096 bits. The recommended length is 2,048 bits.