Cryptography Interview Questions and Answers

Ques 1. what are the prime objectives of modern cryptography?

There are four prime objectives and they are:

1. Confidentiality
2. Non-repudiation
3. Authenticity
4. Integrity

Ques 2. What do you know about cryptosystems? What is its significance?

These are basically some of the important protocols that assure all the objectives of data encryption have been met.

Regulation of human behavior is also an important module in cryptosystems in which it assures that accounts have been logged off from systems, not in use, passwords that are difficult to guess, maintain the privacy of any information or data that is highly sensitive. 

Ques 3. What is the role of Shift Register Cascades in Cryptography?

There are stages when binary bits are needed and this can be done with the help of Linear Feedback Shift Registers.

Registers are required to be connected in such a manner that one register controls the clock for the previous. This type of interconnection is generally regarded as Shift Register Cascades. It shows how the behavior of one register depends on the other.

Ques 4. What is the Digital Signature Algorithm?

The digital signature algorithm was implemented for the authentication of data in the year 1994.

It offers quick signature generation and in addition to this, it ensures better verification of information it is dealing with.

It is actually based on computing discrete algorithms and its security actually depends on the size of the key. It can handle key size up to 1024 bits presently.

Ques 5. Name the two Signature schemes that are used in Cryptography?

• Special Signature scheme
• Blind Signature Scheme

Ques 6. What is the One-Way function?

One-Way function is basically an approach that is used to assure faster information processing for cryptography when data needs to be sent in one way only and no reverse action is possible.

Functions can be computed in one direction within a very short span of time but performing the opposite task can be extremely daunting.

Ques 7. What exactly is the other name of Checksum in Cryptography?

It is called a Message Authentication Code or MAC.

It can be categorized as block chipper based, unconditionally secure, stream cipher based, as well as hash function based.

Ques 8. What is Quantum Cryptography?

When it comes to exchanging secure information over an insecure channel, this approach is considered.

It all depends on the nature of photons in which the third polarization is focused. It can easily be trusted when it comes to exchanging the Secret keys without facing any issue.

Quantum Cryptography is useful when an organization has to send information outside its network without compromising its security and authenticity. It is having a lot of applications in secret and defense operations.

Ques 9. Is Cryptography a legal approach or not?

Cryptography is basically an approach that is used for data security.

However, it has been seen that it can also have a lot of cons associated with it. Only governmental agencies and authorized organizations are allowed to use it in some parts of the world and thus it is not accepted as a legal approach everywhere.

Ques 10. What is the basic principle of Cryptography?

The basic principle of this approach is nothing but to write and solve codes so that information security can be enhanced and that automatically leads to privacy. 

Ques 11. Name the properties of Interactive proof that are useful in Cryptography according to you?

1. Zero Knowledge
2. Soundness
3. Completeness

Ques 12. Define Salting.

Salting is the process of obfuscating passwords by introducing an arbitrary value to them after they’ve been hashed.

Ques 13. What is the reason behind the use of salting in cryptography?

Since individuals will generally reuse passwords, a hacker with a rundown of normal passwords or taken ones secures his position simpler. A Salt is an arbitrarily created number, yet it decreases the chance of being in a predetermined table.

Ques 14. Describe a session key?

A session key ordinarily gets correspondence between two groups.

It is sent with each message among customer and server, client and customer, or two PCs. They are scrambled with the recipient’s public key.