Patent ID: 8108678
Filing Date: 2012-01-31
Classification: H04L

Abstract:
1. An identity-based-encryption (IBE) signcryption method in which a sender signs and encrypts a message M for a recipient, comprising: at the sender, digitally signing and encrypting, with computing equipment, a message M in a signcryption operation using an IBE private key of the sender SK sending, with computing equipment, the ciphertext C to the recipient anonymously, wherein an attacker cannot deduce the authorship of the message from the ciphertext C; at the recipient, decrypting, with computing equipment, the ciphertext C using an IBE private key SK at the recipient or at a third party, after the ciphertext has been decrypted by the recipient, performing, with computing equipment, signature verification in an operation that is separate from the decryption of the ciphertext, wherein performing the signature verification comprises using the decrypted message M and the IBE public key of the sender ID