Question

Try to make it as simple as you can and explain as much as it needed.

1. What are the differences between symmetric encryption and asymmetric encryption? (1 point)

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2. What is pseudo random numbers? (1 point)

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3. What is Moore’s Law? (1 point)

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4. What are four different block cipher modes? (1 point)

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5. What is one-time pad? (1 point)

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Answer 1

What are the differences between symmetric encryption and asymmetric encryption?

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symmetric encryption	asymmetric encryption
One key is required for encryption and decryption	Two keys are required i.e one for encryption and one for decryption
A large amount of data is transferred in this encryption	A small amount of data is transferred in this encryption
Faster encryption	Slower encryption
Eg: AES	Eg: DSA

What are the pseudo-random numbers?

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A set of numbers or elements is not mathematically calculated, but is based on a well-known place and is repeated many times. Random false numbers provide the required values ​​for randomly required processes, such as creating test signals or synchronizing sending and receiving devices in broadcast spectrum streaming. It is called random "fake" because the algorithm can repeat sequences, and the numbers are therefore not completely set.

What is Moore’s Law?

ans:

Moore's law addresses Moore's view that the number of transistors in a microchip doubles every two years, even though the cost of computers is down. Moore's law says we can expect the speed and power of our computer to increase every few years, and we will pay less for it. Another belief in Moore's Law confirms that this growth is an adjective.

What are four different block cipher modes?

ans:

1. Electronic Code Book:(ECB): This method is the common straightforward way of concocting a series of sequentially listed message blocks
2. Cipher Block Chaining(CBC): CBC method of operation provides communication dependence for generating ciphertext and makes the system non-deterministic.
3. Cipher Feedback Mode(CFB): In this mode, each ciphertext block gets ‘fed back’ into the encryption process in sequence to encrypt the next plaintext block.
4. Output Feedback Mode(OFB): It means feeding the successive output blocks from the underlying block cipher back to it. These feedback blocks provide a string of bits to feed the encryption algorithm which acts as the key-stream dynamo as in the case of CFB mode.

and one more included is Counter(CTR) mode.

What is a one-time pad?

ans:

In cryptography, the one-time pad(OTP) is an encryption method that cannot be damaged but requires the use of one time preshared key the identical size as, more distant than the message being sent. In this procedure, a plaintext is matched with a random secret key. Then, each bit or character of the plaintext is encrypted by merging it with a similar bit or character from the pad using modular addition.