澳大利亚:总理宣布“末日到来”

澳大利亚总理吉拉德在录制一档电视节目时,以幽默的口吻"力挺"有关世界末日的预言。她在节目中说:"预言者是正确的,这个月就是世界末日的来临。"她甚至向所有民众宣称:"我的同胞们,世界末日就要来啦。这不是千禧年危机,也不是碳税,而是玛雅人     

A Practical Approach to Attaining Chosen Ciphertext Security

Strong security in public key cryptography is not enongh; the encryption has to be achieved in an efficient way. OAEP or SAEP is only suitable for special applications （e. g. key transport）, and securely transporting message of any length is a challenge. Motivated by the hybrid encryption, we present a practical approach to achieve the （adaptively） chosen eiphertext security. The time cost of encryption/decryption of proposed scheme is similar to OAEP and the bandwidth of message recovery is 92% for standard security parameter, while RSA-OAEP is 84%. The scheme is also provably secure against adaptively chosen ciphertext attacks in the random oracle model. We conclude that the approach is practical in more extensive application.