Application of Biometric Key in Practical Secret Sharing for DNSsec

Secret sharing is one of the branches of threshold cryptography. Secret sharing is intended to secure a secret key s among a group G with n participants. Thus, the secret key s can be reconstructed by collecting shares of t or more participants. Recently, the secret sharing concept has been applied in securing DNSsec root key. However, the idea of DNSsec root key security is based on Shamir’s (t, n)-secret sharing scheme and has implemented a smart card as a media to store the share information. To improve the system, we have considered Yang et al.’s scheme, one of the earlier practical secret sharing, to apply in DNSsec. By combining these two systems, we propose a biometrics-based practical secret sharing for DNSsec to resolve the problem with the storage media used. Also, we improve the drawbacks of Yang et al.’s scheme by producing a more efficient and asynchronous reconstruction phase compared to other secret sharing. Furthermore, it is applicable to the DNSsec system. Keywords—Practical, Secret Sharing, DNSsec, key protection