Research Article
A Novel IM Sync Message-Based Cross-Device Tracking
Table 3
Features of four applications’ sync messages.
| | Application | Device type | Packet direction | Packet length |
| | QQ | PC | | (200, MTU)-97 | | Mobile phone | | (200, 1000)-(200, 1000)-(100, MTU) |
| | WeChat | PC | or | | | Mobile phone | | |
| | WhatsApp | PC | or | | | Mobile phone | or | |
| | Facebook Messenger | PC (web) | or | (100,MTU)-(0,100)-(0,100)-(0,100) or (100,MTU)-(87 or 94)-54 | | Mobile phone | or | (200,MTU)-66-(54,MTU)-66 or (200,MTU)-(101 or 99)-66 |
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