关键词: 多级加密, 软件融合, 双层气囊模型, 假意病毒破坏机制, 病毒功能援引

Abstract: With the continuous development of information technology, the U disk encryption system has become important content in the commercial confidentiality in the U disk encryption process involving the business security and social public security document is likely to be damaged and interception, so documents in order to protect the confidentiality, integrity, prevent the document was leaked, tampered with; At the same time, in order to strengthen the senior confidential documents, as well as to the U disk holders or participants to recognize validated, must adopt a new technology -- multi-level encryption technology, make its can achieve higher secrecy. Firstly briefly introduced the research background，research of the theory, principle of multilevel encryption, etc. Secondly introduces the principle of multi-level encryption technology and multi-level encryption technology in the design process. Finally using high-level programming language c # on Microsoft. NET development comprehensive technologies to realize the multilevel encryption tools, finally solves the content of U disk encryption security problems.

Key words: multilevel encryption, software integration, double airbag model, love false virus damage mechanism, virus function was quoted as saying