Block cipher mode research based on identifier of text files

Abstract

The electronic code book(ECB)mode cannot conceal the data model of the plaintext and has only one private key to the whole plaintext.A block cipher mode based on identity for text files was proposed，which ab-sorbed the advantages of block cipher mode and the feature of plaintext string.A double Hash mapping structure was designed and one layer of the mapping structure maps the plaintext into discontinuous groups,another one which was based on the concept of identify library produced corresponding private key to the plaintext group.The model overcame the discontinuous group and single private key problem and effectively improved the security of the cipher text.The experiment results show that the new model has better security,flexibility and extensibility.

Keywords

• text encryption;encryption model;block encryption;identity encryption