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Introduction to IoT Security Challenges

IoT Security is not a theory its real.

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Reason	Explanation
Resource Constraints	Limited CPU, memory → hard to run strong security controls
Scale & Diversity	Thousands of devices, different vendors → hard to manage
Physical Exposure	Devices can be accessed or tampered with in the field
Long Lifespan	Devices run for years with poor or no updates
Insecure Defaults	Weak passwords, open ports, outdated firmware
Inconsistent Standards	Security exists, but not applied consistently

Layer	Focus	Key Concerns
Device-Level	Hardware + firmware	Secure boot, tampering, firmware integrity
Upper Stack	Data, APIs, cloud	Auth, encryption, APIs, IAM

If device layer fails, upper layers receive fake but valid-looking data.

Your dashboards will lie.

Attack Example: Attacker sends 10,000 fake requests > API crashes > system unavailable

Attack Example: Open S3 bucket -> attacker downloads sensitive sensor data

Attack Example: Captured MQTT message replayed > system thinks event happened again

[ Device ]     [ Attacker ]
     \             /
      \           /
       ---> [ MQTT Broker ] ---> [ Cloud ] ---> [ Dashboard ]

[ Device ] ---> ❌ Attacker ---> [ MQTT Broker ]

Attack Example: Attacker plugs into device > flashes modified firmware > device becomes a bot

Attack Example: Compromise one device -> scan network -> take over others

Attack Example: Cheap cloned sensor sends manipulated data from day 1