根据你以上的要求，我写出了一份demo：
```python
import json
import requests

pack = {
    "serialnumber": "",
    "appcode": "",
    "body": {}
}

token = ''

def crypto(data: str, token: str) -> str:
    raw_pack = json.dumps(data + token)
    pass # 填入加密算法

def sign(data: str) -> str:
    pass # 填入签名算法

encrypted_data = crypto(pack, token)

requests.post('http://example.com/api/', data={"data": encrypted_data, "signature": sign(encrypted_data)})
```
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