public static DecodableCipher<String, String> toDecodableCipher(final JwtBuilder accessTokenJwtBuilder,
                                                                    final RegisteredService registeredService) {
        return new OAuth20JwtAccessTokenDecodableCipher(registeredService, accessTokenJwtBuilder);
    }
To decodable cipher.

@param accessTokenJwtBuilder the access token jwt builder
@param registeredService     the registered service
@return the decodable cipher
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/support/oauth/web/response/accesstoken/response/OAuth20JwtAccessTokenEncoder.java