Cryptography

Question 1

Kerberos Structure

Answer 1

Default Authentication protocol/method.
Symmetric and asymmetric.
Made up of a Key distribution Center (KDC)
Authentication Server (AS)
Ticket Granting Service (TGS)
Ticket Granting Ticket (TGT)

Question 2

DES

Answer 2

Block Cipher 56 bit outdated, Symmetric

Question 3

3DES

Answer 3

Block cipher (3 x 56) 168 bit key. Can use up to 3 keys much slower than des

Question 4

AES

Answer 4

block cipher uses 256 keys bits replaces DES much faster

Question 5

IDEA

Answer 5

Symmetric key block cipher uses 128 used in PGP originally

Question 6

Twofish

Answer 6

symmetric key block cipher of about 128 bit blocks keys up to 256

Question 7

Blowfish

Answer 7

Symmetric block. variable key from 32 to 448 64 bit block size feistel cipher pub domain

Question 8

RC (rivest Cipher)

Answer 8

rc2 - rc6

Question 9

Diffie-hellman

Answer 9

Asymmetric Key exchange protocol. used in ssl and ipsec. can be vuln to mitm if signature waived

Question 10

El Gamal

Answer 10

Asymmetric key based on diffie-hellman. used in PGP now. to solve discrete problems for encryption and digital signatures

Question 11

RSA

Answer 11

strong uses two prime numbers. Factoring numbers creates keys up to 4096. Encryption and digital signatures.

Question 12

MD5

Answer 12

128 bit hash 32 digit hexadecimal

Question 13

Sha-1

Answer 13

160 bit value out

Question 14

sha-2

Answer 14

224, 256, 384 512 bit output

Question 15

RIPE-MD

Answer 15

The # indicates the bit length. works through 80 stages and then through modulo 32

Question 16

CA

Answer 16

3rd party creates and issues digital certificates used to verify identity. keeps track of all certificates within the system. Maintain CRL. Public Key

Question 17

RA

Answer 17

RA is responsible for accepting requests for digital certificates and authenticating the entity making the request. An entity that is responsible for one or more of the following functions: the identification and authentication of certificate applicants, the approval or rejection of certificate applications, initiating certificate revocations or suspensions under certain circumstances, processing subscriber requests to revoke or suspend their certificates, and approving or rejecting requests by subscribers to renew or re-key their certificates. RAs, however, do not sign or issue certificates (i.e., an RA is delegated certain tasks on behalf of a CA)

Question 18

Block Cipher 56 bit outdated, Symmetric

Answer 18

DES

Question 19

Block cipher 168 bit key. Can use up to 3 keys much slower than des

Answer 19

3DES

Question 20

block cipher uses 128, 192, 256 keys bits replaces DES much faster

Answer 20

AES

Question 21

block uses 128 used in PGP originally

Answer 21

IDEA

Question 22

symmetric key block cipher of about 128 bit blocks keys up to 256

Answer 22

Twofish

Question 23

rc2 - rc6

Answer 23

Rivest

Question 24

Asymmetric Key exchange protocol. used in ssl and ipsec. can be vuln to mitm if signature waived

Answer 24

Diffie-hellman

Question 25

Asymmetric key based of diffie-hellman. used in PGP now. to solve discrete problems for encryption and digital signatures

Answer 25

El Gamal

Question 26

strong uses two prime numbers. Factoring numbers creates keys up to 4096. Encrypion and digital signatures

Answer 26

RSA

Question 27

128 bit hash 32 digit hexadecimal

Answer 27

MD5

Question 28

160 bit value out

Answer 28

Sha-1

Question 29

224, 256, 384 512 bit output

Answer 29

sha-2

Question 30

The # indicates the bit length. works through 80 stages and then through modulo 32

Answer 30

RIPE-MD

Question 31

3rd party creates and issues digital certificates used to verify identity. keeps track of all certificates within the system. Maintain CRL. Public Key

Answer 31

CA

Question 32

is responsible for accepting requests for digital certificates and authenticating the entity making the request. An entity that is responsible for one or more of the following functions: the identification and authentication of certificate applicants, the approval or rejection of certificate applications, initiating certificate revocations or suspensions under certain circumstances, processing subscriber requests to revoke or suspend their certificates, and approving or rejecting requests by subscribers to renew or re-key their certificates. RAs, however, do not sign or issue certificates (i.e., an RA is delegated certain tasks on behalf of a CA)

Answer 32

RA