Stream ciphers operate on which of the following

1.    Which of the following implements a security policy that specifies who and what may have access to each specific system resource and the type of access that is permitted in each instance.a.    Access controlb.    resource controlc.    System controld.Audit control2.    Stream ciphers operate on which of the following?a. Fixed-length groups of bits called blocksb. Individual digits, one at a time, with the transformation varying during the encryptionc. individual blocks, once ata time, with the transformation varying during the encryptiond. fixed length groups of digits called blocks.3.    In AES that is also known as Rjindael, there are:a. 10,12 or 14 cycles for keys of 128, 192 and 256 bits, respectivelyb. 10,14 or 16 cycles for keys of 128, 192 and 256 bits, respectivelyc. 12, 14 or 16 cycles or keys of 128, 192 and 256 bits, respectivelyd. none of the above4.    Hashing is used to provide which of the following?

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