The correct statements are:

1. Block length of 64 bits and a key length of 56 bits are the shortcomings of DES: This is correct. The Data Encryption Standard (DES) does indeed have a block size of 64 bits and a key length of 56 bits. These are considered shortcomings because they make DES vulnerable to brute-force attacks.

2. AES block cipher has a 128-bit block length and uses a 128-bit key: This is also correct. The Advanced Encryption Standard (AES) does have a block size of 128 bits and can use keys of 128, 192, or 256 bits.

The incorrect statements are:

1. AES block cipher is not proven to be secure against computational adversary: This is incorrect. AES is widely regarded as secure against all known practical attacks when used properly.

2. A 11-bit change to a DES S-box input ensures at most 11-bit change in the output: This is incorrect. In DES, a change in one bit of the input will on average cause changes in half of the bits of the output, due to the properties of the S-boxes. This is known as the avalanche effect.

Question

The correct statements are:

1. Block length of 64 bits and a key length of 56 bits are the shortcomings of DES: This is correct. The Data Encryption Standard (DES) does indeed have a block size of 64 bits and a key length of 56 bits. These are considered shortcomings because they make DES vulnerable to brute-force attacks.

2. AES block cipher has a 128-bit block length and uses a 128-bit key: This is also correct. The Advanced Encryption Standard (AES) does have a block size of 128 bits and can use keys of 128, 192, or 256 bits.

The incorrect statements are:

1. AES block cipher is not proven to be secure against computational adversary: This is incorrect. AES is widely regarded as secure against all known practical attacks when used properly.

2. A 11-bit change to a DES S-box input ensures at most 11-bit change in the output: This is incorrect. In DES, a change in one bit of the input will on average cause changes in half of the bits of the output, due to the properties of the S-boxes. This is known as the avalanche effect.

Knowee AI · Accepted Answer

The correct statements are:

1. Block length of 64 bits and a key length of 56 bits are the shortcomings of DES: This is correct. The Data Encryption Standard (DES) does indeed have a block size of 64 bits and a key length of 56 bits. These are considered shortcomings because they make DES vulnerable to brute-force attacks.

2. AES block cipher has a 128-bit block length and uses a 128-bit key: This is also correct. The Advanced Encryption Standard (AES) does have a block size of 128 bits and can use keys of 128, 192, or 256 bits.

The incorrect statements are:

1. AES block cipher is not proven to be secure against computational adversary: This is incorrect. AES is widely regarded as secure against all known practical attacks when used properly.

2. A 11-bit change to a DES S-box input ensures at most 11-bit change in the output: This is incorrect. In DES, a change in one bit of the input will on average cause changes in half of the bits of the output, due to the properties of the S-boxes. This is known as the avalanche effect.

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