I am unable to create SecKey from serverPublic key. I get the below error Error Domain=NSOSStatusErrorDomain Code=-50 "EC public key creation from data failed" UserInfo={numberOfErrorsDeep=0, NSDescription=EC public key creation from data failed} My code looks like this so far. Not sure what is going wrong. let attributes: [String: Any] = [ kSecAttrKeyType as String: kSecAttrKeyTypeEC, kSecAttrKeyClass as String: kSecAttrKeyClassPublic, kSecAttrKeySizeInBits as String: 256 ] let serverPublicKey = "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEGcpMOdqpgCt3Lhvy8pqBcPgQdKcj646CqJWArdcvkaTZfIGADRsk6TkKuvcHVE+excJ2fKlZDLLRt1vy8n7xww==" guard let serverPublicKeyData = Data(base64Encoded: serverPublicKey) else { return } var error: Unmanaged<CFError>? guard let serverPublickeySec = SecKeyCreateWithData(serverPublicKeyData as CFData, attributes as CFDictionary, &error) else { throw error!.takeRetainedValue() as Error }