time signatures

To reduce the amount of memory required to store standard signatures and proxy signatures, and the computational time required to verify their validity, a new notion called unrestricted hybrid aggregate signatures is introduced and formalized.

为了减少实施普通签名和代理签名的存储量和验证这些签名的计算量，提出了一种新的聚集签名，称为无限制混合聚集签名，并给出了形式化定义和安全模型。

SHELBY KNOX: "From the time that Lauren started the petition on Change.org and J.C. Penney pulled the shirt, it was about ten hours, in which it got over two thousand signatures and at one point was generating over four hundred tweets a minute."

Shelby Knox：“从Lauren在Change.org网上发布请愿到彭尼公司将衬衫下架，大约用了10小时，请愿得到了两千个签名，一度每分钟内被转发了400次。”

It was believed to be the first time a president has used an autopen to sign legislation. Autopen signatures generally are reserved for more personalized correspondence that doesn` t score a real signature, say officials from administrations past.

据称，总统借用自动签名机签署法案，这在历史上首开先例。美国政府官员曾透露，自动签名机通常用于更加私人化的普通信件，因为它们无需亲笔签名。

Digital signatures are base of identity authentication, data integrity and protection of non-repudiation service. At the same time they are important tool in e-commerce and the electronic contract.

数字签名是实现网络身份认证、数据完整性保护和非否认服务的基础，也是开展电子商务和签订电子合同的重要工具，所以数字签名在现代密码系统中起着十分重要的作用。