Multiple and Unlinkable Public Key Encryption Without Certificates

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Executive Summary

The authors newly propose a multiple and unlinkable identity-based public key encryption scheme. Unlike the traditional public key encryption and identity-based encryption schemes, the scheme allows the use of a various number of identity-based public keys in different groups or applications while keeping a single decryption key so that the decryption key can decrypt every ciphertexts encrypted with those public keys. Also the scheme removes the use of certificates as well as the key escrow problem so it is functional and practical. Since the public keys are unlinkable, the user's privacy can be protected from attackers who collect and trace the user information and behavior using the known public keys.

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