Encryption

Question 1

El gamal

Answer 1

Primarily used for transmitting digital signatures and key exchange

Question 2

KPMS - key management practices standard

Answer 2

Is a document that describes in detail the organizational structure, responsible roles and rules for key management

Question 3

ECC - elliptic curve crypto system

Answer 3

Similar function to RSA but with smaller key sizes (less computing power) current US government standard

Question 4

AES - advanced encryption standard

Answer 4

128/192/256 bit key 10/12/14 rounds of substitution and transposition, replaced in 3DES standard

Question 5

3DES- triple data encryption standard

Answer 5

64 bit/48 rounds substitution and transposition using either 2 or 3 keys - replaced by DES considered to be depreciated

Question 6

3DES- triple data encryption standard

Answer 6

64 bit/48 rounds substitution and transposition using either 2 or 3 keys - replaced by DES considered to be depreciated

Question 7

Key

Answer 7

This is mathematical signature used for encryption data process, asymmetric had 2 keys, symmetric 1 key

Question 8

Private key

Answer 8

Key mathematically related to a public key asymmetric encryption, hold by receiver, top secret

Question 9

Encryption

Answer 9

Is commonly used to protect the confidentiality of data transit and data rest. Process
Clear text=> algorithm key => cipher text => algorithm + key=>clear text

Question 10

Rc4- rivest cipher 4

Answer 10

Stream cipher key 40-2048 bits. It encrypts messages one byte by one at a time via an algorithm. The most popular. 4 variants:
1. Spritz
2. RC4a
3. Vmcp
4. RC4a+

Question 11

Asymmetric algorithm

Answer 11

Encryption uses 2 mathematically related keys to encrypt and decrypt keys are referred to as public and private key. Public key is freely distributed.private secured keys are top secret, handled by owner.
Is computer resources intensive, key 2048 or more, scalable, designed for key exchange,
Process:
Clear text=> asymmetric. Alg. + asymmetric key |M1 Key|=> cypher text =>|M2 key| symm. Alg, +asym key=> clear text

Question 12

RSA

Answer 12

Widely implemented de facto commercial standard.works with encryption and digital signatures. Encrypts communication between two parties over an insecure network like the internet.is used with Transport layer security (TLS) to establish secure connections between web servers and web browsers, moreover RSA aids secure email communication by providing a way to encrypt and decrypt messages.

Question 13

Pubic key

Answer 13

Key mathematically connected to person private key holder, is publish and used in asymmetric encryption

Question 14

Symmetric encryption

Answer 14

Uses the ONE KEY, the same key is used to encrypt and decrypt data. The key may be referred to as a single key,shared key, secret key or session key. Is computionally efficient, key 128/192/256 bits, not scalable, inherently insecure
Process
Clear text=> symmetric key+ algorithm => ciphertext=> symmetric algorithm + symmetric key=> clear text

Question 15

DIFFE - HELLMAN

Answer 15

Primary used for key agreement (key exchange) allows 2 parties to (in the same DH group) that have no prior knowledge of each other to jointly establish a shared secret key

Question 16

Session key

Answer 16

Is an interaction between a user and web server characterized by exchange of information. Personal X encrypts message and is sending its current timestamp using randomly generated session key

Question 17

Data at rest encryption

Answer 17

Data encrypted on a storage device, in windows you can use bitlocker,

Question 18

Transparent encryption

Answer 18

Encrypt all database information with a symmetric key

Question 19

Record level encryption

Answer 19

It encrypt individual columns, areas of data, use separate symmetric keys for each column.

Question 20

Transport encryption

Answer 20

Protecting of data traversing the network, communication on network https protocol, VPN (virtual private network) encrypts all the data transmitted over the network, regardless of the application. Client based VPN is using SSL/TLS, site-to siege VPN is using IPSec

Question 21

Encryption algorithm

Answer 21

This is a proper formula which must be used during encryption and decryption. Both sides decide on the algorithm before encrypting the data. The details are often hidden from the end user (does not see details of algorithm).

Question 22

Out of band key exchange

Answer 22

Encryption key exchanges method, where key is not send via network (telephone, courier, via person)

Question 23

In band key exchange

Answer 23

We don’t have luxury time we need to be able to encrypt a single communication immediately in our browser so we would need to use some type of band, which means some type of information is gonna be across the network. For example-to encrypt a symmetric key, send that asymmetrically encrypted key to a third-party and they can decrypt it to obtain a symmetric key.