基于Waters的ID加密的高效選擇密文安全公鑰密碼體制
Efficient Chosen Ciphertext Secure Public Key Cryptosystem from the ID-Based Encryption of Waters
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摘要: 2004年的歐密會(huì)上，Canetti, Halevi和Katz提出了將Selective-ID安全的基于身份加密方案轉(zhuǎn)化為選擇密文安全(即, CCA安全)的公鑰加密方案的方法。但由于該方法需要用到一次性簽名，給所基于的方案增加了明顯的通信和計(jì)算負(fù)載。該文由Waters提出的Adaptive-ID安全的基于身份加密(IDE)方案構(gòu)造了一個(gè)新的CCA安全公鑰加密方案。這里的身份由前兩部分密文的hash值得到，密文合法性由雙線性映射來驗(yàn)證。其效率比直接利用CHK的一般轉(zhuǎn)化得到方案有明顯提高。新方案的安全性在標(biāo)準(zhǔn)的決定性雙線性Diffie-Hellman假設(shè)下被證明。
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關(guān)鍵詞:
- 加密;選擇密文安全性;基于身份加密;決定性雙線性Diffie-Hellman問題
Abstract: In Eurocrypt 2004, Canetti, Halevi and Katz proposed a method for constructing Chosen Ciphertext secure ( ie., CCA secure) public key encryption from any Selective-ID secure ID-Based Encryption (IBE). However, this method needs one time signature and thus adds noticeable overhead to the underling scheme. In this paper, a new CCA secure public key cryptosystem is constructed from the Adaptive-ID secure IBE scheme proposed by Waters. Here, the identity is the hash of the first two parts of the ciphertext, and the bilinear map is used to test the ciphertext validity. The proposal is much more efficient than those obtained from the general CHK method. The security of the new scheme is proved under the standard Decisional Bilinear Diffie-Hellman (DBDH) assumption. -
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