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Data Security and Privacy (Protection (Access control (Example (Bell…

- - - - Admin controls all r/w/x permissions
    - - Each user decides
    - - Bell-LaPadula Model
        
        Multi-level security
        
        1) A lower security subject cannot read a higher security object
        2) A higher security subject cannot write to a lower security object
        
        Confidentiality
      - Biba Integrity Model
        
        1) A higher security subject cannot read from a lower security object
        2) A lower security subject cannot write to a higher security object
        
        Integrity
      - High-water Bell-LaPadula
        
        After higher security subject writes to lower security object, increase security level of object to level of subject
      - Low-water Biba Integrity
        
        After higher security subject reads from lower security object,
        decrease security level of subject o level of object
    - - Access control matrix
      - Access control list
        
        Which subjects can read/write/execute this object
      - Capabilities
        
        Which objects can this subject read/write/execute
    - - Visual
      - Sound
      - Fingerprint
      - Gait
  - - - Append a tag to a file
        
        Checksums
        
        e.g. CRC32
        
        Hashes
        
        A weak cryptographic hash may be a good error detection hash (e.g. MD5)
        
        Input can be any size, output is fixed
        (32-bit for CRC32, 128-bit for MD5)
        
        Parity
    - - Error Correction Codes(ECC)
        
        Hamming code
  - - - Stores all changes between current time and last full backup
- - - - Queries only including Bob
      - Difference of queries
      - Intersection of queries
- - - - Each anonymity set must have at least l different attributes