Abstract

Identity-Based (IB) cryptography is a rapidly emerging approach to public-key cryptography that does not require principals to pre-compute key pairs and obtain certi cates for their public keys|instead, public keys can be arbitrary identi ers such as email addresses, while private keys are derived at any time by a trusted private key generator upon request by the designated principals. Despite the urry of recent results on IB encryption and signature, some questions regarding the security and eciency of practicing IB encryption (IBE) and signature (IBS) as a joint IB signature/encryption (IBSE) scheme with a common set of parameters and keys, remain unanswered.

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