Cryptography Interview Questions and Answers

Ques 1. Define Cryptography and its benefits?

The Cryptography is actually a method of securing communications through some protocols in order to make the information secure or understood able only by the sender as well as the receiver. Earlier this strategy was based on mathematical theories and computer science. However, with improvement in technology, it is presently based on some vast protocols that are difficult to crack. Thus information security, as well as authenticity can always be ensured and it’s the leading benefit of Cryptography.

Ques 2. What are the few major applications of cryptography in the modern world?

There are lots of benefits of cryptography in the modern world and a few of them are:

1. Chip-based payment cards
2. Computer and other passwords
3. E-commerce
4. Defense communications
5. Digital Currencies
6. Designing protocols
7. Data authenticity

Ques 3. What is decryption? What is its need?

Cryptography has two important modules and they are encryption and second is decryption.

Encryption is basically an approach that converts information into secret codes. It is also known as encoding. It is done to make the information secure.

On the other side decryption is a process that is opposite to it i.e. converting the coded information back to its actual form. Only the receiver knows the protocols to decode that information. 

Ques 4. What are the major threats to any data or information for which it needs cryptography?

There are a lot of threats in fact and you might have no idea that with respect to advancement in technology, the reverse effect of the same has also enhanced all over the world.

Hackers can steal data and any sensitive information upon leaking can create issues for the business, a government, financial institution as well as for a person individually.

The leak of confidential information can put the entire organization at risk.

Therefore data needs to be secured. 

Ques 5. What do you mean by Secret Key Cryptography and Public Key Cryptography? How they are different from one another

Both these are the algorithms of encryption and contribute to data security.

Secret Key Cryptography can be used for both encryptions as well as decryption. It is also considered an asymmetric approach and contains only one key.

On the other hand, Public Key cryptography is basically an asymmetric approach.

There are two keys in this approach and one is basically the public key and any user can access the information. The other key is private and can only be accessed by the administrator. 

Ques 6. How Hash Functions are different from Public Key Cryptography and Secret Key Cryptography?

They are basically considered single-way encryption.

Unlike Public Key Cryptography and Secret Key Cryptography, they don’t have any key in them and their prime function is to make sure that a file has reached its destination without any modification. 

Ques 7. What type of information can be secured with Cryptography?

Well, there is no strict upper limit on that. Any information that needs some privacy can be encrypted with this approach.

However, in the present scenario, most of the information belongs to secret operations, business data, defense applications, and lots more.

Cryptography is an approach that can encode both digital, as well as analog information and data without facing any issue.

Ques 8. In case a Cryptography tool is not available and you need to send secret information, would you proceed or wait till the presence of the tool?

It all depends on the security of the network itself in such a case. If the network is secure, the information can be shared.

In case not, I will probably wait for the Cryptography tool to be active. This is because any information without proper encryption can easily be leaked. 

Ques 9. What exactly do you know about RSA?

It is basically a public key cryptography approach that is based on encryption, as well as authentication.

It was first used in the year 1977 and is based on prime number logic. It is basically a fast approach that can handle multiple operations at a time. However, if the key size is small, it generally performs its operation slower.

Ques 10. Name the elements of a cryptography tool?

There are basically three important elements.

The first is the sender which in fact also encrypts the information in a secured form.

The other is the receiver where information is received and decoded.

The third is the channel in fact which connects both sender and receiver.

Most of the attacks for data-stealing are made on a channel only. This is the reason that why data or information on it always remains in a coded form.

Ques 11. Explain the difference between a crypter and a cryptographer.

A cryptographer is somebody who does cryptography, and that implies planning or dissecting any part of encryption.

A crypter, then again, is an individual attempting to guilefully camouflage some malware as anything different like a helpful program, so that it can be spread undetected.

Ques 12. What are the significant dangers to any information or data that needs cryptography?

There are a ton of dangers indeed, and you may have no clue about that; as for headway in innovation, the converse impact of the equivalent has additionally improved everywhere.

Programmers can take information, and any delicate data after spilling can make issues for the business, an administration, monetary organization just as for an individual exclusively. The break of private data can put the whole association in danger. In this manner, information should be secured.