A SIM card, or Subscriber Identity Module card, is a small electronic chip used in mobile devices to store the International Mobile Subscriber Identity (IMSI) and other data that allows the device to connect to a mobile network. Here are the key features and functions of a SIM card: 1. **Identity Verification**: The SIM card authenticates the user's identity with the mobile network provider, allowing the user to make calls, send texts, and access data services.

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  1. Cryptographic hardware
  2. Cryptography
  3. Applied mathematics
  4. Fields of mathematics
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