All the current geometric hashing methods are just suitable for the 2D object recognition under affine transformation.

This paper presents a content-based image retrieval technique based on salientpoints matching and geometric hashing.

It combines geometric Hashing scheme with surface segmentation based on cu rvature analysis.

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.