Encryption

Question 1

What is Encryption at rest ?

Answer 1

Protect data which is stored in a laptop or any device from theft or any kind of misuse.

Used when one single identity is involved.

Question 2

Example of EAR

Answer 2

Shared Physical hardware or your personal laptop.

Question 3

What is Encryption in transit ?

Answer 3

Protect data when it is transferred or received.
It is essentially a shield or wrapper around our data.

Used when multiple parties are involved.

Question 4

Example of EIT

Answer 4

Data leaving our laptop will be encrypted and sent to the bank and vice versa.

Question 5

Plain Text

Answer 5

Unprotected data in the form of text, image, audio etc.

Question 6

Cipher Text

Answer 6

Encrypted data.

Question 7

Algorithm

Answer 7

Piece of code which uses plain text and a key to generate a cipher text.

Question 8

Key

Answer 8

Just a password used by the algorithm

Question 9

Characteristics of Symmetric Encryption

Answer 9

Encryption Key === Decryption Key

Question 10

Working of Symmetric Encryption

Answer 10

Sender and receiver agree upon an algorithm.

Plain text and symmetric key is used by the algorithm and cipher text is generated and will be sent to the receiver.

Question 11

Drawbacks of Symmetric Encryption

Answer 11

No secure way of sending the key to the receiver or the key should be shared in advance which is complex.

Question 12

Characteristics of Asymmetric Encryption

Answer 12

A set of key:

Used when two or more parties are involved (remote location).
Public Key strictly used for ENCRYPTION
Private Key strictly used for DECRYPTION

Question 13

Using asymmetric Encryption for sending symmetric key.

Answer 13

Take the public key of the receiver.
Generate a symmetric key and encrypt the key with public key and then send it to the receiver.

Receiver decrypts the key with the private key and use the symmetric key to communicate further.

Question 14

Working of Asymmetric Encryption

Answer 14

Sender and receiver agree upon an algorithm.

Plain text and public key of robot is used by the algorithm and cipher text is generated and will be sent to the receiver.

Then receiver uses the private key with the algorithm to decrypt the cipher text.

Question 15

Drawbacks of Asymmetric Encryption

Answer 15

Complex computation is involved.

Question 16

Uses of asymmetric encryption

Answer 16

SSL, TSL and SSH.

Question 17

Signing

Answer 17

Process of verifying an identity. PRIVATE KEY IS NOT DISCLOSED.

Question 18

Working of Signing

Answer 18

Robot general will sign the ‘OK’ message with private key and send it to the cat ruler and it verifies using the public key.

Question 19

Steganography

Answer 19

Process of embedding important information into an image or any other piece of data.

Question 20

Example of Steganography

Answer 20

Cat ruler will use the public key of the robot general and generate cipher text, then embed the cipher text in a puppy image using steganography and send it to robot general.

Then robot general will decode the cipher from the puppy image. Then decrypt using private key.

Robot general encrypts the data with public key of cat ruler and then signs the ‘OK’ message with private key.
Then embed the cipher text in the puppy image and send it to the cat ruler.