With the high speed (133MHz) of the computer PCI bus ,this encyption system can encrypt and decrypt data quickly. Its hardward is composed of PCI interface module, CPLD module, key generatoe module, data encryption and decryption modules. In the second version, voltrage converter module and DSP module are added to the system.
Without any modification to underlying protocol or wireless network infrastructure, this solution can be implemented with available limited resources of J2ME MIDP device, and realize client authentication and data transfers security by encrypt and decrypt at a different level according to the content of data.
In this paper, the basic principle and the realization of using the pseudo - random characteristic of the m Sequence to encrypt and decrypt the computer datum are introduced, and the safety performance is also analyzed.
Contrary to these, an encryption file system (EFS—Encryption File System) can be designed through combining encryption techniques and file systems in order that EFS can automatically encrypt and decrypt the files or the directories in the system.
This thesis proposed a simple and efficient mechanism to protect the Java class file on the customer end, based on the traditional ways. The new mechanism has some main features as below:(l)Employ the C++ program to encrypt and decrypt the Java class file in the customized ClassLoader, using the local decryption library called by JNI;
EFS use advanced and standard encrypt arithmetic to achieve transparent encrypt and decrypt any individual or program without appropriate cryptographic key is unable to neither read nor write encrypted data.