Learning of names and principles appears at the early stage of He Yan\'s thoughts,which is helpful not only for the complete study of his thoughts,but also for the deep investigation of the unique perspective of his thoughts of nothingness.

A threshold proxy signature scheme based on elliptic curve cryptosystem;

Digital proxy signature scheme with privacy protection;

Designated-receiver proxy signature scheme;

The undisclosed agency in Contract Law may be an adapt explanation to the relatio.

WT5”BZ]By comparing the similarities and differences between the stipulations about agency in China and those in UK and USA,and〈The Agency Convention〉,and analyzing both the civil agency and the external trade agency,we conclude that it is rational to institute undisclosed agency in China.

Starting with the analysis to the definitions, origin and design of undisclosed agency in common law system and contrasting it to the rules of agency and commission agency in civil law system, the author first brings forward a new theory as to the differences of agency law between common law system and civil law system.

A proxy signatures scheme based on (t,n) threshold;

The paper briefly describes the characteristics and development of the proxy signatures.

Any malicious proxy signers and the origina l signer can impersonate some other proxy signers to generate proxy signatures.