# snmp_agent_sim.py - SNMPv3 agent using well-known EngineID
from pysnmp.hlapi import *

def snmp_get(engine_id=SnmpEngineID(hexValue='8000000001020304')):
    iterator = getCmd(
        SnmpEngine(engineID=engine_id),
        CommunityData('public', mpModel=0),  # not v3, but demo
        UdpTransportTarget(('localhost', 161)),
        ContextData(),
        ObjectType(ObjectIdentity('SNMPv2-MIB', 'sysDescr', 0))
    )
    errorIndication, errorStatus, errorIndex, varBinds = next(iterator)
    print(varBinds)

# Vulnerability: EngineID is guessable; attacker can compute authentication keys offline.
print("SNMPv3 with default EngineID vulnerable to key derivation attacks.")