In this paper, randomness evaluation of cryptography is studied and block cipher is selected as a research instance.

Cryptography is the crucial technique in the information security field, so research on it becomes even more important and exigent.

Design Of The Communication Cryptography Platform Based On Embedded Chip;

The principles of cryptographic algorithm are analysed , and the plan of solving tampering problem of applied program with digital signature is proposed in detail.

In the paper we analyze the some reason of error implement for cryptographic algorithm,give a several of cryptanalysis example based on error implement of cryptographic algorithm?We conclude the paper with various methods for preventing these attacks.

The fractal theory and its application in cryptology is discussed,and a novel fractal cryptographic algorithm is given.

This paper describes the cipher system,the classification of the cipher system and several well-known cipher algorithms,which are used wildly in the computer network in information security system.

Generally, the problem about cryptology comes down to the design and analysis of cipher algorithms and protocols.

In order to meet the security requirement of the data transmission in the RFID system by the internet for things,this paper brings forward a cipher algorithm based on bit-transposition in the RFID system.