Cryptography Interview Questions and Answers

Ques 1. What exactly do you know about SAFER? What is its abbreviation?

SAFER stands for Secure and Fast Encryption Routine and is basically a block chipper.

It has a 64-bit block size and is a byte-oriented algorithm that is widely used. Its encryption and decryption procedures are highly secure and have 10 rounds out of which 6 can be used freely. This technology has wide application in digital payment cards.

Ques 2. What is the Fast Data Encipherment Algorithm?

It is basically a cryptosystem that has a 64-bit block size.

Its prime aim is to assure the performance of the software in which it is used. However, due to its insecure approach, it is not so common in the present scenario.

Ques 3. What is the difference between Block chippers and Stream Chippers?

Both Block Chippers and Stream Chippers have a similar objective but both operations in a different manner.

Stream Chippers are faster when compared to block.

Block chippers generally operate on the data which is large in size while on the other side, Stream chippers are considered when small units of text are to be considered.

Stream Chipper seems complex in handling the assigned tasks while the Blok chipper is best in performing the same.

In addition to this, block chipper results always error-free and can be trusted for the long run.

Ques 4. How you will generate a sequence of binary bits in cryptography?

This can be done with the help of the Linear Feedback Shift Register.

It can perform this task reliably. The register is loaded with some cells that can easily be initialized through a vector which in most cases is nothing but a secret key. At every clocking instant, it is possible to regulate the behavior of the register and thus best outcomes can be assured. It shifts its content to right one by one till every bit is placed on the left side. 

Ques 5. What do you mean by DNA computing?

It is nothing but a collection of random strands of DNA that can be combined to find the solution to a specific problem.

It works perfectly on both basic and as well as large-scale strands.

The other name of DNA computing is Molecular computing. By parallel search, it aims to solve some of the very complex problems that can declare their presence in the cryptography approach.

Ques 6. When will you use a shrinking generator in Cryptography?

When a direct interaction is required in the outputs of Linear Feedback Shift Registers, this can be used.

It is actually scalable up to a great extent and has excellent securing properties that make it a good approach to trust.

The shrinking generator can also be used to analyze how to secure information is. It can also be used to imposing a limit on the size of data that needs to be controlled.

Ques 7. What do you know about the Vernam Chipper?

In case the bits are generated randomly, this is the chipper that is used for controlling their actions.

It combines them with plain text reliably and the output is regarded as hypertext. Thus a very secure environment can be assured and the best part is it’s not very difficult to use this approach.

Ques 8. What do you know about a Compression Function in Cryptography?

It is basically an approach that is used for securing the information reliably.

A Compression function takes input in the form of a fixed length of bits and the outcome is shorter. A method is generally divided into smaller blocks for its easy authentication and implementation in the cycle. Each small block is then processed and the output is the combination of bits and hash value.

Ques 9. Is it possible to combine cryptography with any other data security approach?

Yes, it’s possible to do so.

Ques 10. Describe Rainbow Tables.

Rainbow tables are pre-registered tables that comprise hash numerals or digits similar to plaintext codes.

Also, these can be utilized by programmers to match taken hashes to likely passwords. It permits passwords or codes to be broken significantly quicker however requires high stockpiling capacities.

Ques 11. In the Realm of cryptography, define FEAL.

A block cipher that has been intended to be proficient in hardware and software is known as FEAL Algorithm.

Ques 12. Define Trapdoor Functions.

Trapdoor Functions are such works that can undoubtedly be tackled in a single course; however, they are very tedious and troublesome in the other bearing.

Playing out the opposite computation easily is conceivable yet requires a particular cycle.

Ques 13. In cryptography, what is meant by Blowfish?

When altering keys, a blowfish is indeed an asymmetric block key encryption that is efficient yet demands pre-processing equivalent.

Ques 14. Why is SSL encrypting insufficient?

SSL only secures your information while it is in transit. It does not safeguard data after it reaches the recipient. SSL also does not encrypt your information. When it comes to processing metadata, this might be a flaw. This enables your prospective hacker to create a client profile and consider network layouts.