Download ECCouncil.212-81.VCEDumps.2024-04-08.70q.tqb
| Vendor: | ECCouncil |
| Exam Code: | 212-81 |
| Exam Name: | Certified Encryption Specialist |
| Date: | Apr 08, 2024 |
| File Size: | 312 KB |
Demo Questions
Question 1
John is responsible for VPNs at his company. He is using IPSec because it has two different modes. He can choose the mode appropriate for a given situation. What are the two modes of IPSec? (Choose two)
- Encrypt mode
- Transport mode
- Tunnel mode
- Decrypt mode
Correct answer: BC
Question 2
Which of the following would be the weakest encryption algorithm?
- DES
- AES
- RSA
- EC
Correct answer: A
Explanation:
DEShttps://en.wikipedia.org/wiki/Data_Encryption_StandardDES is insecure due to the relatively short 56-bit key size. In January 1999, distributed.net and the Electronic Frontier Foundation collaborated to publicly break a DES key in 22 hours and 15 minutes.Incorrect answers:AES - has been adopted by the U.S. government and is now used worldwide. It supersedes the Data Encryption Standard (DES),which was published in 1977. The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.RSA - The security of RSA relies on the practical difficulty of factoring the product of two large prime numbers, the 'factoring problem'. Breaking RSA encryption is known as the RSA problem. Whether it is as difficult as the factoring problem is an open question. There are no published methods to defeat the system if a large enough key is used.EC - Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. ECC allows smaller keys compared to non-EC cryptography (based on plain Galois fields) to provide equivalent security. DES
https://en.wikipedia.org/wiki/Data_Encryption_Standard
DES is insecure due to the relatively short 56-bit key size. In January 1999, distributed.net and the Electronic Frontier Foundation collaborated to publicly break a DES key in 22 hours and 15 minutes.
Incorrect answers:
AES - has been adopted by the U.S. government and is now used worldwide. It supersedes the Data Encryption Standard (DES),which was published in 1977. The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.
RSA - The security of RSA relies on the practical difficulty of factoring the product of two large prime numbers, the 'factoring problem'. Breaking RSA encryption is known as the RSA problem. Whether it is as difficult as the factoring problem is an open question. There are no published methods to defeat the system if a large enough key is used.
EC - Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. ECC allows smaller keys compared to non-EC cryptography (based on plain Galois fields) to provide equivalent security.
Question 3
Modern symmetric ciphers all make use of one or more s-boxes. Both Feistel and non-Feistel ciphers use these s-boxes. What is an s-box?
- A substitution box where input bits are replaced
- A black box for the algorithm implementation
- A shifting box where input bits are shifted
- Another name for the round function
Correct answer: A
Explanation:
Substitution box where input bits are replacedhttps://en.wikipedia.org/wiki/S-boxIn cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext --- Shannon's property of confusion. Substitution box where input bits are replaced
https://en.wikipedia.org/wiki/S-box
In cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext --- Shannon's property of confusion.
