关键词: 加密强度可定制, 文本加密, 哈希映射

Abstract:  Users have to manage and remember more and more accounts and passwords with the application of all kinds of information systems. Designing a novel, simple, convenient, secure and adaptive encryption policy is becoming urgent requirement, using which the users can realize their own encryption algorithm. This paper proposes a novel strength adaptive encryption policy and a relevant algorithm framework. The encryption algorithm includes three sub-modules, e.g. Hash mapping, blank filling and character encryption. The Hash mapping is used to make password book, and is responsible of placing clear-text or obtaining cipher-text from the buffer according to the password book. Blank filling is used to fill some random characters in the buffer to enhance the security. Character encryption is used to encrypt the character by certain encryption algorithm that the users choose themselves. Through the encryption policy, all users can have their own and specific encryption algorithm according to the practical need. Both the theory analysis and experiments prove that the encryption algorithm is flexible, convenient and secure enough. The theory analysis also proves that it is impossible to crack the password using enumeration method if there is no the correct secret key.

Key words: encryption strength adaptive, text encryption, Hash mapping