An enhanced RMX randomized Hash signature scheme is developed through changing the elective mode of the random value,which does not need the presupposition that the signer should be honest.

Improvement of two dimension Hash algorithm based on association rules;

In the paper we expound some key techniques for the development of an electronic seal system,including system architecture,middleware,HASH algorithm,electronic seal integrity strategy,remote user login technology,electronic document integrity strategy,and digital signature etc.

This paper analyses the advantages and disadvantages of the two cipher algorithms-DES algorithm which is representative of traditional cipher system and RSA which is representative of public key cipher system, brings forward a mode of data encryption-the mix encryption of DES、RSA and HASH combining HASH algorithm to guarantee the security of network data.

Information entropy is adopted to consider the input of Hash function.

ECDSA(elliptic curve digital signature algorithm) is regarded as the world standard elliptic curve signature algorithm,and there are some other related signature algorithms,likewise the format of "kP±lQ" is adopted in all these algorithms,and scalar multiplication should be done twice.