The characteristics of intrinsic security in the future Internet architecture have been used to conquer the secu-rity problems of current Internet. Self-certifying addresses are introduced in future Internet architecture (FIA) to enable the intrinsic security properties. However, without PKI, these approaches in FIA miss the intrinsic binding between user-level descriptor, network-level identifier and correspondent public key. To this end, a naming scheme of Self-Certifying Identi-fier in FIA based on Combined Public Key (CPK), named as SCI-CPK, is proposed in this paper. The use cases of identity authentication based on SCI-CPK in FIA designs are also given, including XIA, MobilityFirst and NDN. The analysis shows that the proposed method is benefit of ubiquitous access and vast mobility scenario in the future Internet.