We are encrypting a volume using CTR mode as described in Section 9.4.2. Given the ciphertext changes and results listed below, which will occur in CTR mode? Select all that apply.
a) A bit-flipping attack only affects the single modified bit in the plaintext block.
b) If we swap two data blocks on the sector, the only plaintext affected are from those two data blocks.
c) If we rewrite the entire sector with a previous version of its contents, the sector will decrypt correctly.

Question

24-11-2022
Computers and Technology

contestada

We are encrypting a volume using CTR mode as described in Section 9.4.2. Given the ciphertext changes and results listed below, which will occur in CTR mode? Select all that apply.
a) A bit-flipping attack only affects the single modified bit in the plaintext block.
b) If we swap two data blocks on the sector, the only plaintext affected are from those two data blocks.
c) If we rewrite the entire sector with a previous version of its contents, the sector will decrypt correctly.

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mary24457181 mary24457181 · Answer 1 · 2022-11-26T22:46:31+01:00

The options that apply are:

A bit-flipping attack only affects the single modified bit in the plaintext block.
If we swap two data blocks on the sector, the only plaintext affected are from those two data blocks.
If we rewrite the entire sector with a previous version of its contents, the sector will decrypt correctly.

The Benefits of Using CTR Mode in Data Encryption

CTR mode is a type of block cipher mode that is particularly well-suited for data encryption. In CTR mode, a counter is used in conjunction with the block cipher to encrypt the data. The benefits of using CTR mode include the following:

1. A bit-flipping attack only affects the single modified bit in the plaintext block.
2. If we swap two data blocks on the sector, the only plaintext affected are from those two data blocks.
3. If we rewrite the entire sector with a previous version of its contents, the sector will decrypt correctly.
4. CTR mode is resistant to chosen-plaintext attacks.
5. CTR mode is a stream cipher, which means that it is particularly well-suited for encrypting data that is being transmitted in real-time.

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