Relative study of event-related potentials elicited by calculating and number recognizing;

Mathematical cognition ability is one of the most importent cognitive abilities of human beings.

This study is on the mathematical cognition of MD,that includes count,quantity conservation,space-time conception,logic conception,calculation and manipulation.

This program focuses on helping mathematical teachers construct conceptual maps of the development of children’s mathematical cognition through education practices and co-researching.

Based on the abstraction of the structure of authentication data and an analysis of data acquisition models in an offline trade system, the article puts forward three feasible methods to receive authentication data, which may be used as reference by system developers.

The Digital Authentication Technology Based on RSA;

Expounded the basic principles and mechanisms of quantum cryptography and quantum cryptography based on the absolute safety of the features that onetime,will be applied to specific e-commerce applications,such as Quantum Digital Signature,Digital Authentication.

This article introduces digital authentication technology in the computer network security,expoundes the principles and functions of digital authentication techniques,and a number of specific applications in the E-government affairs system.

This paper discusses principle and kernel algorithm of PGP, and gives a C language description of the algorithm along with some concepts of the digital signature and the digital certificate.

According to the law of electronic signatures and prescription management practices,this paper uses third-party digital certificate to make the legality of e-priscription be confirmed.

IPSec (IPSecurity Protcol, IP security protocol) is a set of open standards, they are to work together to ensure the right data between devices such as confidentiality, data integrity and data authentication.