电子签章法
electronic signatures act
赋予讯息复原之签章
signature giving message recovery
间接数位签章
mediated digital signature
具附件数字签章
digital signature with appendix
具讯息恢复的数字签章
giving message recovery digital signature
美国条协会数字签章指引
American bar association digital signature guidelines
凭证为基的签章
certificate-based signature