Shield yourself from pattern detection

In a Wireless Body Area Network (WBAN), biosensors are implanted or worn in/on an individual to acquire medical data for a clinical diagnosis or physical monitoring. To achieve confidentiality and privacy of a WBAN, authentication and crypto contribute a lot. However, besides data itself, the pattern of data transmission contains more secretes than it seems to. Various medical sensors deliver data in different patterns and these patterns leak the fact of what sensors are used, which implies diseases the individual has, and how urgent the situation of a patient is. To hide a pattern, we design a container, which packs real data session in a type-independent transmission model at transmission layer. All valid data packets are equably sent at the frequency of container and at the same length to clutter the inherent pace of valid data transmission and other parameters. To construct a container, extra consumption is due for extra container packets. We also find a strategy PAS to achieve an optimized solution of minimizing it while protecting transmission pattern from eavesdropping.