Certificateless
Certificateless cryptography is a class of public-key cryptosystems designed to remove the need for digital certificates to bind public keys to users. The best-known form, certificateless public-key cryptography (CL-PKC), was introduced by Al-Riyami and Paterson in 2003 as a middle ground between identity-based encryption (IBE) and traditional PKI, addressing the key escrow problem of IBE while avoiding certificate management.
In CL-PKC, a trusted authority called a key generation center (KGC) issues a partial private key to
Advantages include removing the burden of certificate management and reducing reliance on PKI, while avoiding the
Terminology and variants: CL-PKC encompasses schemes for certificateless encryption (CLE) and certificateless signatures (CLS). It has