사용자 폐기를 지원하는 책임 기관 ID 기반 암호
Accountable Authority Revocable Identity-Based Encryption
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초록
2001년 Boneh와 Franklin이 제안한 ID 기반 암호는 기존 공개키 기반 구조(PKI)와 달리 사용자의 ID를 공 개키로 사용하기 때문에 공개키 검증을 한 인증서가 필요하지 않다. 하지만 ID 기반 암호는 키 생성 기(PKG) 이 사용자의 비키를 직 발하기 때문에 키 탁 문제가 발생한다. 한, 한 번 발받은 비키는 유효성이 지 속되기 때문에 키 유출 등으로 인한 비키 폐기를 효율으로 진행하기 어려운 문제가 있다. 본 논문에서는 키 탁 문제를 완화하는 책임 기 ID 기반 암호(A-IBE)와 사용자 폐기를 지원하는 ID 기반 암호(RIBE)를 기반으로 두 가지 문제를 모두 해결하는 사용자 폐기를 지원하는 책임 기 ID 기반 암호 (A-RIBE)를 제안한다. 한 A-RIBE에 합한 안성 모델을 새롭게 정의하고, 기반하는 A-IBE와 RIBE에 따 른 A-RIBE의 설계원리와 그 장·단을 분석한다.
Abstract
In 2001, Boneh and Franklin proposed Identity-Based Encryption(IBE) that does not require a certificate like Public Key Infrastructure(PKI) by using user’s Identity as a public key. However, IBE has a key escrow problem because the Private Key Generator(PKG), who is a trusted authority, generates a secret key of every user. Also, it does not support efficient revocation when the user’s secret key is exposed or the system needs to revoke the user. Therefore, in order to use IBE as PKI that currently used, it is necessary to solve the key escrow problem and the revocation problem. In this paper, to solve those two problems, we suggest Accountable Authority Revocable IBE(A-RIBE) based on Accountable Authority IBE that mitigates the key escrow problem and Revocable IBE that solves the revocation problem. Also, we define the security model suitable foe A-RIBE, and analyze the principle of designing A-RIBE according to based A-IBE and RIBE and their advantage and disadvantage.
참고문헌 (19)
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