Security and Data Management - Data Security and Compression

Parkwood Vale Groceries stores information about its staff.

Except for encryption, describe two software methods that could be used to protect the security of this data. [4]

Demonstrate how 10101010 would be encrypted by Parkwood Vale Groceries’ system and then decrypted using the XOR encryption method.

The key used is 11110000. [4]

Describe the dangers that organizations' face from using computers to store personal data. Do not include malware in your answer. [4]

Lossy and lossless are two types of data compression used to compress digital graphics. A certain method uses the following compression ratios:

Lossy 10:1 Lossless 10:9

Calculate the resulting file size using Lossy compression for a 200 KB image. [1]

Lossy and lossless are two types of data compression used to compress digital graphics. A certain method uses the following compression ratios:

Lossy 10:1 Lossless 10:9

Calculate the resulting file size using Lossless compression for a 200 KB image. [1]

Lossy and lossless are two types of data compression used to compress digital graphics. A certain method uses the following compression ratios:

Lossy 10:1 Lossless 10:9

Explain why one of these compression types is unsuitable for a text document. [3]