Cryptography Key Concepts

The video tutorial introduces asymmetric key cryptography, highlighting the differences from symmetric key cryptography. It explains the roles of public and private keys in a network and discusses four cases of encryption and decryption. The RSA algorithm is introduced as a secure method used in real-life applications. The tutorial concludes with the relevance of asymmetric key cryptography in exams like GATE and UGC NET.

What is the main challenge in symmetric key cryptography?

• Decrypting the data

• Sharing the same key securely

• Generating the keys

• Encrypting the data

In asymmetric cryptography, what is the role of the public key?

• To encrypt messages

• To store data

• To decrypt messages

• To generate private keys

Which key is used to decrypt a message encrypted with a public key?

• The corresponding private key

• The same public key

• Any private key

• A different public key

Why can't a message encrypted with A's public key be opened by B?

• B needs a different private key

• B needs a different public key

• B needs A's private key

• B doesn't have A's public key

Which case is valid for secure message encryption between A and B?

• Encrypt with A's public key

• Encrypt with B's private key

• Encrypt with A's private key

• Encrypt with B's public key

What is the primary use of the receiver's public key in encryption?

• To decrypt messages

• To verify identity

• To encrypt messages

• To generate new keys

Which algorithm is a real-life application of asymmetric cryptography?

• DES

• RSA

• AES

• Blowfish

How many keys are needed for four devices in symmetric cryptography?

• 10

• 8

• 4

• 6

What is the formula for calculating the number of keys in asymmetric cryptography?

• nC2

• 2N

• N/2

• N^2

In a network of four devices, how many keys are required in asymmetric cryptography?

• 6

• 10

• 8

• 4