15 D5

Question 1

___ is a popular 1 way hash algorithm used to create digital signatures. Produces an output of 160 bits.

Answer 1

Secure Hash Algorithm (SHA)

Question 2

___ are a particular class of hashing algorithm devised to solve the problem of detecting errors in messages transmitted through communication lines. Have small key sizes.

Answer 2

Checksums

Question 3

CA categories:

__ __ are self-signed and can sign intermediate certifications.

Answer 3

Root certificates

Question 4

___ algorithms use the same key to perform both encryption and decryption

Answer 4

Symmetric key algorithms

Question 5

Type of Certificates:
___ - Contains the public key of a particular CA. They can be what’s called a ‘self-signed’ certificate or signed by another CA.

Answer 5

Certificate Authority cert

Question 6

__ supports keys from 0 to 448 and operates in block mode with a block size of 64.

Answer 6

Blowfish

Question 7

SSL Security Features:
___ - Each record is run through a message digest such as MD5. The receiving end reverses the process using the same message using the same message digest to ensure data integrity.

Answer 7

Data Integrity

Question 8

___ supports keys from 128, 196, and 256. It operates in block mode with a block size of 128.

Answer 8

Advanced Encryption Standard (AES)

Question 9

___ algorithms use 2 keys, public and private, with mathematical relations to each other. If one encrypts, only the other can decrypt and vice versa.

Answer 9

Asymmetric key algorithms

Question 10

___ produces either 128 bit or 256 bit hash codes. Can run with a variable number of rounds of the internal algorithms.

Answer 10

Snefru

Question 11

___ was developed by IBM to extend the life of the original DES due to limited 56-bit key. There are 2 modes.

Answer 11

Triple Data Encryption Standard (3DES)

Question 12

Digital Signatures:

___ Key - portion of the key used to sign an email. Is password protected, users should never give their keys to anyone.

Answer 12

Private Key

Question 13

__ was designed for 32 bit computers and outputs a 128 bit hash.

Answer 13

MD5

Question 14

3 SSH Authentication methods are:

___ ___ ___

Answer 14

.rhosts
.rhosts and RSA
Password

Question 15

__ issue digital certificates. Are a trusted 3rd party. The widely used specification/standard is X.509.

Answer 15

Certification Authorities

Question 16

Types of Certificates:

___ - Contains individuals public keys used to verify users identity.

Answer 16

Personal cert

Question 17

3DES-__ Uses 3 different keys for an effective key strength of 168 bits; theoretically susceptible to meet-in-the-middle attack.

Answer 17

3DES-EEE

Question 18

___ works in a client/server fashion with a suite of encryption technologies to ensure secure communications between client and server.

Answer 18

Secure SHell (SSH)

Question 19

SSL Security Features:

___ - Using digital certificate technologies ensures client and server identity.

Answer 19

Authentication

Question 20

___ algorithms are hashing functions used to produce hash codes, which are difficult to reverse. Takes input and produces as output of 128 bit fingerprint/message digest.

Answer 20

Message Digest (MD) algorithms

Question 21

___ is a variable length 1 way hash function. Processes message in 1024 bit blocks.

Answer 21

Haval

Question 22

__ is an integral part of securing DoD/IC networks.

Answer 22

Encryption

Question 23

Types of Certificates:
___ - Contains public keys of individuals or vendors representing a program. Used to verify and trust downloaded programs.

Answer 23

Publisher cert

Question 24

SSH uses ___ keys to create a secret key shared between client and server.

Answer 24

Asymmetric keys

Question 25

___ Exchange was the first practical method for establishing a shared secret over an unprotected communications channel. Not actually a method of encryption and decryption.

Answer 25

Diffie-Heilman Key Exchange

Question 26

CA categories:

__ __ provide the authority to sign server, personal publisher, or other intermediate CA’s.

Answer 26

Intermediate certificates

Question 27

Server uses it private key to decrypt it. The session key is used by whichever cipher (___) is chosen for the data encryption.

Answer 27

symmetric

Question 28

Secure Socket Layer (SSL) is a protocol that provides secure communications through the Web. Was developed by (1)__. Initiated with the (2)__ url prefix. and uses port (3)__.

Answer 28

1- developed by Netscape
2- prefix https
3- port 443

Question 29

__ supports keys up to 256 and operates in block mode with a block size of 128.

Answer 29

Twofish

Question 30

The ___ algorithm is a cryptosystem for public key encryption and is widely used for securing sensitive data, mainly over insecure networks. Based on multiplying 2 prime large #’s.

Answer 30

Rivest-Shamir-Adleman (RSA) Algorithm

Question 31

___ provide verification of temperproof data integrity and that the document originated from the person who signed it. (non-repudiation)

Answer 31

Digital signatures

Question 32

Types of Certificates:

___ - Contains public key of a web server using SSL , used to ID a particular web server

Answer 32

Server cert

Question 33

3DES-__ Uses 2 of the same keys for encryption and one key for decryption. The decryption key does not truly decrypt the message to plain text.

Answer 33

3DES-EDE

Question 34

SSL Security Features:

___ - Data is compressed and encrypted with stream and block encryption cipher.

Answer 34

Privacy/ Confidentiality

Question 35

Digital Signatures:

___ Key - portion of the key that is available to other people.

Answer 35

Public Key

Question 36

SSH ___ stages ensure client is authorized to connect to the server. 3 possible methods.

Answer 36

authentication