@Override
    public String getEncryptionKeySetting() {
        return "cas.authn.mfa.duo[0].registration.crypto.encryption.key";
    }
This is {@link DuoSecurityAuthenticationRegistrationCipherExecutor}.

@author Misagh Moayyed
@since 7.0.0
support/cas-server-support-duo-core/src/main/java/org/apereo/cas/adaptors/duo/authn/DuoSecurityAuthenticationRegistrationCipherExecutor.java