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NEW QUESTION 46
A symmetric block cipher designed in 1993 by Bruce Schneier. Was intended as a replacement for DES. Like DES it is a 16 round Feistel working on 64bit blocks. Can have bit sizes 32bits to 448bits.
Explanation:
Blowfish
Blowfish is a symmetric-key block cipher, designed in 1993 by Bruce Schneier and included in many cipher suites and encryption products. Blowfish provides a good encryption rate in software and no effective cryptanalysis of it has been found to date. However, the Advanced Encryption Standard (AES) now receives more attention, and Schneier recommends Twofish for modern applications.
Blowfish has a 64-bit block size and a variable key length from 32 bits up to 448 bits. It is a 16-round Feistel cipher and uses large key-dependent S-boxes.
Incorrect answers:
Skipjack - symmetric algorithm. Designed by NSA for the clipper chip - a chip with built in encryption. The decryption key was kept in key escrow in case law enforcement needed to decrypt data without the owner's cooperation, making it highly controversial. Uses an 80 bit key to encrypt/decrypt 64 bit data blocks. It is an unbalanced Feistel network with 32 rounds.
Serpent - symmetric algorithm. Designed by Ross Anderson, Eli Biham, and Lars Knudsen. Has a block size of 128 bits. Key size is 128, 192, or 256 bits. Uses a substitution-permutation network instead of Feistel cipher. Uses 32 rounds working with a block of four 32-bit words. Each round applies one of eight 4-bit to 4-bit S-boxes 32 times in parallel. Designed so all operations can be done in parallel.
MD5 - hash function. Created by Ronald Rivest. Replaced MD4. 128 bit output size, 512 bit block size, 32 bit word size, 64 rounds. Infamously compromised by Flame malware in 2012.
NEW QUESTION 47
Which algorithm was U. S. Patent 5,231,668, filed on july 26, 1991, attributed to David W. Kravitz, and adopted by the U. S. government in 1993 with FIPS 186?
Explanation:
DSA
DSA is covered by U.S. Patent 5,231,668 , filed July 26, 1991 and now expired, and attributed to David
W. Kravitz, a former NSA employee. This patent was given to "The United States of America as represented by the Secretary of Commerce, Washington, D.C.", and NIST has made this patent available worldwide royalty-free. Claus
P. Schnorr claims that his U.S. Patent 4,995,082 (also now expired) covered DSA; this claim is disputed.
NEW QUESTION 48
Which of the following would be the fastest.
Explanation:
AES
AES - symmetric cipher. Symmetric keys use the same key for both encryption and decryption. Both the sender and receiver of the data must know and share the secret key. For standard encrypt/decrypt functions, symmetric algorithms generally perform much faster than their asymmetrical counterparts. This is due to the fact that asymmetric cryptography is massively inefficient. Symmetric cryptography is designed precisely for the efficient processing of large volumes of data. In other words, symmetric encryption is generally used for speed and performance, e.g. when there's a large amount of data that needs to be encrypted/protected.
Incorrect answers:
RSA - asymmetric cipher,
DH - Diffie-Hellman key exchange is a method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman.
EC - Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields.
NEW QUESTION 49
Which of the following is used to encrypt email and create digital signatures?
Explanation:
RSA
RSA use for encryption email and create digital signatures
NEW QUESTION 50
......
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NEW QUESTION 46
A symmetric block cipher designed in 1993 by Bruce Schneier. Was intended as a replacement for DES. Like DES it is a 16 round Feistel working on 64bit blocks. Can have bit sizes 32bits to 448bits.
- A. Serpent
- B. MD5
- C. Skipjack
- D. Blowfish
Explanation:
Blowfish
Đang tải…
en.wikipedia.org
Blowfish has a 64-bit block size and a variable key length from 32 bits up to 448 bits. It is a 16-round Feistel cipher and uses large key-dependent S-boxes.
Incorrect answers:
Skipjack - symmetric algorithm. Designed by NSA for the clipper chip - a chip with built in encryption. The decryption key was kept in key escrow in case law enforcement needed to decrypt data without the owner's cooperation, making it highly controversial. Uses an 80 bit key to encrypt/decrypt 64 bit data blocks. It is an unbalanced Feistel network with 32 rounds.
Serpent - symmetric algorithm. Designed by Ross Anderson, Eli Biham, and Lars Knudsen. Has a block size of 128 bits. Key size is 128, 192, or 256 bits. Uses a substitution-permutation network instead of Feistel cipher. Uses 32 rounds working with a block of four 32-bit words. Each round applies one of eight 4-bit to 4-bit S-boxes 32 times in parallel. Designed so all operations can be done in parallel.
MD5 - hash function. Created by Ronald Rivest. Replaced MD4. 128 bit output size, 512 bit block size, 32 bit word size, 64 rounds. Infamously compromised by Flame malware in 2012.
NEW QUESTION 47
Which algorithm was U. S. Patent 5,231,668, filed on july 26, 1991, attributed to David W. Kravitz, and adopted by the U. S. government in 1993 with FIPS 186?
- A. AES
- B. RSA
- C. DSA
- D. RC4
Explanation:
DSA
Đang tải…
en.wikipedia.org
W. Kravitz, a former NSA employee. This patent was given to "The United States of America as represented by the Secretary of Commerce, Washington, D.C.", and NIST has made this patent available worldwide royalty-free. Claus
P. Schnorr claims that his U.S. Patent 4,995,082 (also now expired) covered DSA; this claim is disputed.
NEW QUESTION 48
Which of the following would be the fastest.
- A. RSA
- B. DH
- C. AES
- D. EC
Explanation:
AES
Đang tải…
en.wikipedia.org
Incorrect answers:
RSA - asymmetric cipher,
DH - Diffie-Hellman key exchange is a method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman.
EC - Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields.
NEW QUESTION 49
Which of the following is used to encrypt email and create digital signatures?
- A. AES
- B. SHA1
- C. RSA
- D. DES
Explanation:
RSA
Đang tải…
en.wikipedia.org
NEW QUESTION 50
......
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