mcq 队列_MCQ | 密码学中作为IDEA,DES,AES,RSA的块密码
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1) In the AES-128 algorithm there are mainly __________ similar rounds and _________ round is different from other round.
1)在AES-128算法中,主要有__________個相似的回合,而_________個回合與其他回合不同。
5 similar rounds having 2 pair ; every alternate
5個類似的回合有2對; 每隔一個
9 ; the last
9; 最后
8 ; the first and last
8; 第一個和最后一個
10 ; no
10; 沒有
Answer: b. 9; the last
答案: b。 9; 最后
Explanation:
說明:
Basically, in the AES-128 there are 9 rounds and the last round is different from other rounds.
基本上,在AES-128中有9個回合,最后一個回合與其他回合不同。
2) Which of the following modes of operation in DES is used for operating?
2)DES中以下哪種操作模式用于操作?
Cipher Feedback Mode (CFB)
密碼反饋模式(CFB)
Cipher Block chaining (CBC)
密碼塊鏈接(CBC)
Electronic code book (ECB)
電子密碼書(ECB)
Output Feedback Modes (OFB)
輸出反饋模式(OFB)
Answer: c. Electronic code book (ECB)
答: c。 電子密碼書(ECB)
Explanation:
說明:
Mainly, the Electronic codebook mode is used for operating on short data as the same key is used for each block in this algorithm. Thus convert in Plain Text lead to repetitions in Cipher Text in cryptography.
主要是,電子密碼本模式用于對短數據進行操作,因為此算法中的每個塊都使用相同的鍵。 因此,以純文本格式轉換會導致密碼學中的密文重復。
3) Using Rivest, Shamir, Adleman cryptosystem with p=7 and q=9. Encrypt M=24 to find ciphertext. The Ciphertext is:
3)使用p = 7和q = 9的Rivest,Shamir,Adleman密碼系統。 加密M = 24以找到密文。 密文是:
42
42
93
93
114
114
103
103
Answer: c. 114
答: c。 114
Explanation:
說明:
Calculate n = p × q = 63Phi(n)=(p-1) x (q-1)=48Let e=5 , where gcd(e,phi(n))=1Plaintext M = 24Ciphertext = C ≡ M^e (mod n)= 24^5 mod 63 = 7962624 mod 161Ciphertext transmitted = 114.4) International Data Encryption Algorithm (IDEA) was developed by
4)國際數據加密算法(IDEA)由
Xuejia Lai and James Massey
賴雪佳和詹姆斯·梅西
Xuejia Lai and Bruce Schneier
賴雪佳和布魯斯·施耐爾
Xuejia Lai and Carlisle Adams
賴雪佳和卡萊爾·亞當斯
Xuejia Lai and Stafford Tavares
賴雪佳和斯塔福德·塔瓦雷斯
Answer: a. Xuejia Lai and James Massey
答: 賴雪佳和詹姆斯·梅西
Explanation:
說明:
It is a symmetric key block cipher designed by James Massey of ETH Zurich and Xuejia Lai and in 1991 it firstly described it.
它是ETH Zurich的James Massey和Xuejia Lai設計的對稱密鑰分組密碼,它于1991年首次對其進行了描述。
5) When do we compare the AES with DES, which of the following functions from DES does not have an equivalent AES function in cryptography?
5)我們何時將AES與DES進行比較,以下DES中的以下哪個函數在密碼學中沒有等效的AES函數?
f function
f功能
permutation p
排列p
swapping of halves
交換一半
xor of subkey with function f
函數f的子項的異或
Answer: c. swapping of halves
答: c。 交換一半
Explanation:
說明:
Mainly, there is no equivalent to swapping of halves in the AES algorithm in cryptography.
主要地,在密碼學中,AES算法中不存在等同于交換一半的問題。
翻譯自: https://www.includehelp.com/cryptography/mcq-block-cipher-as-idea-des-aes-rsa-in-cryptography.aspx
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