The correct answer is D. All of the above.
Data encryption techniques are used to protect data from unauthorized access, use, disclosure, disruption, modification, or destruction. They can be used to protect data at rest, in transit, or in use.
Data encryption can be used to reduce storage space requirements by storing only the encrypted data. This can be useful for storing large amounts of data, such as video or audio files.
Data encryption can be used to improve data integrity by ensuring that the data has not been tampered with. This can be useful for storing sensitive data, such as financial or medical records.
Data encryption can be used to protect data in data communication systems by preventing unauthorized parties from intercepting or modifying the data. This can be useful for protecting data that is transmitted over public networks, such as the internet.
Here are some additional details about each option:
- Option A: Data encryption techniques can be used to reduce storage space requirements by storing only the encrypted data. This can be useful for storing large amounts of data, such as video or audio files. For example, if you have a 100MB video file, you could encrypt it and store the encrypted file, which would be much smaller than the original file.
- Option B: Data encryption techniques can be used to improve data integrity by ensuring that the data has not been tampered with. This can be useful for storing sensitive data, such as financial or medical records. For example, if you have a financial spreadsheet, you could encrypt it and store the encrypted spreadsheet. If someone were to try to modify the spreadsheet, the changes would be detected when the spreadsheet is decrypted.
- Option C: Data encryption techniques can be used to protect data in data communication systems by preventing unauthorized parties from intercepting or modifying the data. This can be useful for protecting data that is transmitted over public networks, such as the internet. For example, if you are sending an email that contains sensitive information, you could encrypt the email before sending it. This will prevent anyone who intercepts the email from reading the contents of the email.