Secure Network Coding against Wiretapping and Byzantine Attacks

1 Information Security Center, State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, P. O. Box 145, Beijing 100876, China 2Key Laboratory of Network and Information Attack and Defence Technology of MOE, Beijing University of Posts and Telecommunications, P. O. Box 145, Beijing 100876, China 3National Engineering Laboratory for Disaster Backup and Recovery, Beijing University of Posts and Telecommunications, P. O. Box 145, Beijing 100876, China