| 摘要 |
Embodiments of the present invention disclose a ciphertext processing method, apparatus, and system. The method includes: selecting a random secret value; calculating a private key according to a partial private key acquired by the local end and the random secret value; calculating a proxy key according to the private key of the local end and a public key publicized by an opposite end, where the public key is calculated by the opposite end according to a random secret value selected by itself and a system public parameter; and sending the proxy key, so that the opposite end acquires a ciphertext obtained after a re-encryption operation is performed, according to the proxy key, on a ciphertext sent by the local end, and performs decryption. Therefore, information security is ensured better and the Public Key Infrastructure (PKI) is avoided, thereby having better extensibility. |
