SIM Card Forensics

1. The SIM (subscriber identity module) is a fundamental component of cellular phones. It also known as an integrated circuit card (ICC), which is a microcontroller-based access module.
2. It allows users to port identity, personal information, and service between devices.
3. Security in SIM
   
   SIM cards have built-in security features. The three file types, MF, DF, and EF, contain the security attributes. These security features filter every execution and allow only those with proper authorization to access the requested functionality. There are different level of access conditions in DF and EF files. They are:
   

• Always—This condition allows to access files without any restrictions.
• Card holder verification 1 (CHV1)—This condition allows access to files after successful verification of the user’s PIN or if PIN verification is disabled.
• Card holder verification 2 (CHV2)—This condition allows access to files after successful verification of the user’s PIN2 or if the PIN2 verification is disabled.
• Administrative (ADM)—The card issuer who provides SIM to the subscriber can access only after prescribed requirements for administrative access are fulfilled.
• Never (NEV)—Access of the file over the SIM/ME interface is forbidden.

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