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{"ops":[{"insert":"1a. In the context of core Access Control\u00a0\nDefine the following:\ni. The notion of User-Role assignment (UA relation) [5 Marks]\u00a0\nii. Define Discretionary Access Control (DAC) \n\nb. Briefly describe the processes of encryption and decryption in relation to cryptography.\u00a0\n\nc. Explain how public key cryptography may be used for identification. \n\n2. a. Explain how access control lists are used to represent access control matrices. Describe the\u00a0\nenvironments in which they are widely used and their advantages and disadvantages. \n\nb. What is the plaintext for the following ciphertext, which was encrypted using a Caesar\u00a0\nsubstitution cipher: \ni. FRURQD SDQGHPLF DWWDFN\u00a0\nii. XQLWHG ZH VWDQG WRJHWLHO\u00a0\n\nc. List the names of five security services desired in computer networks. For each service,\u00a0\nexplain what the service means.\n\n\n"}]}
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