Answer the following statements true (T) or false (F)
1. Format-preserving encryption refers to any encryption technique that takes a plaintext in a given format and produces a ciphertext in the same format.
2. It is possible to convert a block cipher into a stream cipher using cipher feedback, output feedback and counter modes.
3. Cipher Feedback Mode conforms to the typical construction of a stream cipher.
4. OFB mode requires an initialization vector that must be unique to each execution of the encryption operation.
5. The XTS-AES mode is based on the concept of a tweakable block cipher.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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Fill in the blank(s) with the appropriate word(s).
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