6.2 Explain cryptography algorithms and their basic characteristics.

Question 1

1 symmetric encryption in the world

Answer 1

AES - by default is 128-bit.

Question 2

DES

Answer 2

56-bit Key symmetric encryption

Question 3

3DES

Answer 3

168-bit key symmetric encryption

Question 4

worlds only streaming cipher

Answer 4

RC4

Question 5

Blowfish

Answer 5

64-bit symmetric encryption

Question 6

Twofish

Answer 6

128-bit symmetric encryption

Question 7

OTP (One-Time-Pad)

Answer 7

considered unbreakable
use a key that is as long as a plain-text message
Keys are used only once and then discarded

Question 8

1 Asymmetric encryption in the world

Answer 8

RSA (Rivest Shamir Adelman)

Question 9

DSA (Digital Signature Algorithm)

Answer 9

**Can be used only for signing data and it cannot be used for encryption.

Asymmetric encryption

United States Federal Government standard for digital signatures.

Question 10

Diffie-Hellman

Answer 10

Used for exchanging encryption keys over an untrusted network.
Asymmetric encryption

Question 11

El Gamal

Answer 11

Asymmetric encryption

Derived from Diffie-Hellman

Question 12

Elliptic curve cryptography (ECC)

Answer 12

Used for cell phones

Asymmetric encryption

Question 13

Pretty Good Privacy (PGP) / Gnu Privacy Guard (GPG)

Answer 13

Asymmetric/Symmetric HYBRID encryption

Widely used for email encryption

Question 14

Secure Socket Layer (SSL)

Answer 14

Primarily used for secure online transactions such as online shopping or banking.
– HTTPS
– FTPS

weaker than TLS

Question 15

How many Asymmetric encryption standards are there for the test?

Answer 15

5

• Diffie-Hellman
• ElGamal
• DSA
• RSA
• ECC

Question 16

Transport Layer Security (TLS)

Answer 16

Like SSL, TLS is used for secure connections over the Internet
– HTTPS
– FTPS

Stronger than SSL

Question 17

1 hashing algorithm in the world

Answer 17

MD5 (Message Digest 5)

Question 18

MD5 message digest length

Answer 18

Produces a 128-bit / 32 character message digest from variable length data.

Question 19

How many bit is SHA1?

Answer 19

SHA-1: 160 bit hash from any size of data.

Question 20

test question about military phones uses Sha2. How many bits?

Answer 20

SHA-2: 256 bit hash (32 byte word)

Question 21

RIPEMD (RACE Integrity Primitives Evaluation Message Digest)

Answer 21

RIPEMD-160 performs like SHA-1 and is same size

Question 22

HMAC (Hash-based Message Authentication Code)

Answer 22

HMAC is never used alone

The Size Varies, it takes on the size of whatever you are using it with.

Question 23

BCRYPT

Answer 23

A password hashing function based on the Blowfish cipher

Question 24

Password-Based Key Derivation Function 2 (PBKDF2)

Answer 24

key stretching software

Question 25

XOR

Answer 25

obfuscation

Question 26

Substitution ciphers

Answer 26

type of coding or ciphering system that changes one character or symbol into another. Caesar cipher

Question 27

ROT13 is this

Answer 27

Caesar cipher/Substitution ciphers

Question 28

``` You are responsible for e-commerce security at your company. You want to use the most widely implemented asymmetric algorithm available today. Which of the following is the most widely used asymmetric algorithm today? A. RSA B. AES C. 3DES D. SHA ```

Answer 28

A. RSA

Question 29

``` You need to encrypt your hard drive. Which of the following is the best choice? A. DES B. RSA C. AES D. SHA ```

Answer 29

C. AES

Question 30

``` Which of the following is similar to Blowfish but works on 128-bit blocks? A. Twofish B. IDEA C. CCITT D. AES ```

Answer 30

A. Twofish