projects about operating system

1. asyn-system:

• Built an asynchronize system using producer-consumer model;
• It can process several different I/O heavy tasks:
  • files concatenation;
  • file checksum;
  • file compression;
  • file encryption/decryption;

2. system-call-file-encryption:

• Built a system call for file encryption/decryption;
• Using AES ciphers in CBC mode;

3. wrap-vfs-firewall:

• Implemented firewall functions in wrapped vfs which will be mounted to vfs;
• The firewall function contains malicious signature database; Any file operations in vfs will be processed and filtered by the firewall before it goes into lower file system;
• Added IOCTL for firewall control;