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A Survey on Certificateless Encryption Techniques

Certificateless public key encryption is an advanced version of identity-based and public key encryption techniques. It eliminates the inherent key escrow and other key management issues in both techniques, e.g., it does not need any public key infrastructure or digital certificates. This paper presents a survey of the certificateless public key encryption schemes that have been proposed to improve efficiency and security. We examine the construction, infrastructure, and security models to compare published schemes and their security levels. Analyses and comparisons show that many of the different schemes are based on public key infrastructures and/or are identity based. Analyses and comparison results also show that some schemes have correct generally inclusive security concepts, while others are comparatively insecure and inefficient.