Here, we have a set of multiple-choice questions and answers (quiz) on Block Cipher as IDEA, DES, AES, RSA in Cryptography.

### questions

Title
###### In the AES-128 algorithm there are mainly __________ similar rounds and _________ round is different from other round

In the AES-128 algorithm there are mainly __________ similar rounds and _________ round is different from other round.

1. 5 similar rounds having 2 pair ; every alternate
2. 9 ; the last
3. 8 ; the first and last
4. 10 ; no
###### Which of the following modes of operation in DES is used for operating?

Which of the following modes of operation in DES is used for operating?

1. Cipher Feedback Mode (CFB)
2. Cipher Block chaining (CBC)
3. Electronic code book (ECB)
4. Output Feedback Modes (OFB)
###### Using Rivest, Shamir, Adleman cryptosystem with p=7 and q=9. Encrypt M=24 to find ciphertext. The Ciphertext is:

Using Rivest, Shamir, Adleman cryptosystem with p=7 and q=9. Encrypt M=24 to find ciphertext. The Ciphertext is:

1. 42
2. 93
3. 114
4. 103
###### International Data Encryption Algorithm (IDEA) was developed by

International Data Encryption Algorithm (IDEA) was developed by

1. Xuejia Lai and James Massey
2. Xuejia Lai and Bruce Schneier
3. Xuejia Lai and Carlisle Adams
4. Xuejia Lai and Stafford Tavares
###### When do we compare the AES with DES, which of the following functions from DES does not have an equivalent AES function in cryptography?

When do we compare the AES with DES, which of the following functions from DES does not have an equivalent AES function in cryptography?

1. f function
2. permutation p
3. swapping of halves
4. xor of subkey with function f
###### Data encryption standard is a block cipher and encrypts data in blocks of size of _____ each

Data encryption standard is a block cipher and encrypts data in blocks of size of _____ each.

1. 16 bits
2. 64 bits
3. 32 bits
4. All of the mentioned above
###### The process of decryption of an AES ciphertext is similar to the encryption process in the ______

The process of decryption of an AES ciphertext is similar to the encryption process in the ______.

1. Reverse order
2. Next order
3. Both A and B
4. All of the mentioned above
###### AES stands for Advanced Encryption Standard,

AES stands for Advanced Encryption Standard,

1. True
2. False
###### RSA algorithm is ____ cryptography algorithm

RSA algorithm is ____ cryptography algorithm.

1. Systematic
2. Symmetric
3. Asymmetric
4. None of the mentioned above
###### Amongst which of the following is / are true with reference to the rounds in AES –

Amongst which of the following is / are true with reference to the rounds in AES –

1. Byte Substitution
2. Shift Row
3. Mix Column and Key Addition
4. All of the mentioned above
###### total MCQs: 10 MCQs

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