Bessie C. Hu Duncan S. Wong Qiong Huang 0001 Guomin Yang Xiaotie Deng Time Capsule Signature: Efficient and Provably Secure Constructions. 126-142 2007 conf/europki/2007 EuroPKI https://doi.org/10.1007/978-3-540-73408-6_9 db/conf/europki/europki2007.html#HuWHYD07