ID-PKCIdentifier-Based Public Key Cryptography (CESG)
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CL-PKC not only overcomes key escrow problem but also does not lose some advantages of ID-PKC. Key generation cryptography (KGC) in CL-PKC only issues the partial private key to a user.
As we know ring signature has been studied greatly in traditional PKC [18, 21, 22] and ID-PKC [17, 23-27].
According to these definitions, we can easily find that the conventional certificateless cryptography can reach Level 2, and a traditional PKI can achieve Level 3 while the ID-PKC falls into Level 1.