Are you trying to make a career in information security? Here, we offer RSA interview questions and answers from basics to advanced. Of course! We provide you with the hand-picked and most useful RSA interview questions and answers in this blog. Read this blog post thoroughly to ace your interviews in RSA and stay ahead of your competitors.
Information security is one of the most crucial aspects of data communication. If you want to transfer sensitive data, you must send them with the highest level of protection so that others cannot access and read the data. Information security is highly needed in military applications. It is also much-needed in transferring highly-confident commercial and scientific information.
On this note, cryptography and its algorithms play a crucial role in information security. RSA is one of the cryptographic algorithms with which you can encrypt and decrypt original messages or plaintext effectively. This is why the demand for information security professionals is on the rise nowadays. Candidates with sound knowledge of cryptographic techniques and RSA algorithms are highly-sought in the job market.
This blog post aims at providing you with the RSA interview questions and answers in a crisp way. This blog has split the questions into three categories:
SIEM is the short form for Security Information and Event Management. With SIEM, you can monitor and analyze real-time events accurately. Also, you can log security data for compliance and make informed decisions. Simply put, you can completely protect networks, data, and other sensitive resources from potential threats and vulnerabilities.
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Cryptography is one of the powerful methods used to perform secure data transfer. Encryption and decryption are the two crucial techniques used in cryptography to encode and decode data, respectively. Cryptography allows only the sender and receiver to read the data. You must note that you can perform encryption and decryption using various algorithms based on the applications and requirements.
|Related Article: Cryptography Tutorial|
There are three types of cryptography as follows
A session key is used for both encryptions as well as decryption. In a way, a session key is also a public key. But the significant thing is that you can only generate a session key for a specific session. In other words, a session key is a temporary key that becomes invalid once the session is over.
RSA stands for Rivest, Shamir, and Adleman. They are the computer scientists who developed the RSA algorithm. RSA algorithm is one of the cryptographic algorithms with which you can make secure data communication. Also, it is an asymmetric algorithm that uses both public and private keys. RSA Algorithm performs two essential tasks – one is generating keys and another is encrypting as well as decrypting information.
|Related Article: What is RSA Algorithm?|
2FA is the two-step verification process that you can use for making secure data transfer. In other words, this process uses two authentication factors to perform a secure data transfer. Usually, a password may be one of the authentication factors, and another would be a security token or biometric. Here, the biometric can be a fingerprint or facial scan. Providing additional security mechanisms is the key focus of 2FA so intruders cannot easily access the data being transferred.
It is a robust security mechanism used to perform two-factor authentication. This mechanism generates authentication codes for every RSA token. The authentication codes are sent to receivers through SMS, email, or other modes. The receivers will enter the codes to ensure authentication. This authentication process is completed in a short span for every token. As a whole, this mechanism ensures reliable and secure information transmission.
It is a digital signature scheme, which includes inserting a digital signature as well as asymmetric keys. Three steps are involved in implementing the RSA signature mechanism: RSA signing, key generation, and verifying the signature. RSA signature mechanism effectively uses modular exponentiations, discrete algorithms as well as RSA algorithms for its processes.
It is the software that directs the requests of users to the RSA authentication manager server for authentication. It allows only authorized users to access applications securely.
SSL stands for Secure Sockets Layer. It is an encryption-based internet security protocol. With this protocol, you can ensure authentication, privacy, and data integrity of data transfer on the internet. In short, SSL provides privacy through the encryption process. It ensures authentication through a handshaking process to verify the authenticity of the sender as well as the receiver. SSL employs the digital signature method to ensure the integrity of the data being transferred.
Applying system hardening techniques reduce risks and vulnerabilities in computer systems significantly. It is the process of strengthening the security of data and other resources through effective tools and best practices. You can apply hardening techniques in many ways. For example, you can frequently audit security systems, eliminate unnecessary accounts, quickly patch vulnerabilities, and so on.
Know that there are many types of system hardening, such as Application hardening, server hardening, Operating System hardening, database hardening, endpoint hardening, and network hardening.
The DiD or Defense in Depth is one of the powerful mechanisms used in cyber security to secure data and systems. DiD is a set of defense layers leveraged in systems to protect them from various risks and vulnerabilities. The multiple defense layers can include firewalls, intrusion detection systems, malware scanners, integrity audits, encryption methods, etc. Simply put, you can tightly close all the gaps in the security arrangements in systems using this method.
It is the process of adding unique strings of characters to a password before making a hash. Salting is performed to increase the strength of the password. Here, the string of characters is known as salts. You can either prefix or suffix a password with the salt.
It is a simple but essential note that a good salt will usually be long and unique.
A Euclidean algorithm helps to find the Greatest Common Divisor (GCD) of two numbers. If you want to get the GCD of two numbers, you need to factorize the numbers and then multiply the common prime factors. Note that the extended Euclidean algorithm is another type of Euclidean algorithm.
DES is the short form of Data Encryption Standard (DES). Like RSA, it is yet another cryptographic algorithm that encrypts and decrypts data using the block-cipher method. This algorithm uses 48-bit keys to convert the 64-bit blocks of the plaintext into cipher text.
|RSA Algorithms||DSA Algorithms|
|RSA is the cryptographic algorithm||DSA is the Digital Signature Algorithm|
|It is used for secure message transmission||It is used for creating digital signatures and verification|
|It works based on the product of two large prime numbers||It works based on discrete algorithms and modular exponentiation|
|Decryption is slower than DSA||Decryption is faster than RSA|
|Encryption is faster than DSA||Encryption is slower than RSA|
|It works based on asymmetric key encryption. So RSA generates both public and private keys.||It works based on symmetric encryption. So the same key is used for both encryption and decryption.|
|Anyone can generate a public key, but only authorised persons can use the private key.||Only authorised persons can access the keys.|
|RSA uses integer factorisation, which is more vulnerable when the integer is short.||DSA uses discrete logarithms,which is more vulnerable|
Attackers can break RSA security in the following days.
Following are the RSA vulnerabilities that will challenge the effectiveness of the RSA algorithm.
The keys must have at least 1024 bits. You can use 2048 and 4096 bits keys if you want to send highly-sensitive messages.
ECDHE refers to Diffie-Hellman Ephemeral that uses Elliptic Curve cryptography. In this RSA method, both the server and the browser share a key to encrypt the web traffic. Once the key is discarded, the contents of the web traffic will no longer be available. Mainly, you can prevent man-in-the-middle attacks using this method.
We cannot replace RSA with AES. This is because we can use RSA to encrypt messages. You cannot use RSA for encrypting arbitrary data.
We apply padding to increase the security of RSA-encrypted data. In this process, random data is added to the actual message to make the RSA-encrypted data more secure and unbreakable.
Optimal Asymmetric Encryption Padding (OAEP) is one of the padding methods used to add data to the plaintext. The random data is added to the message before the encryption and removed after the decryption.
In encryption, you encrypt the plaintext and convert it to ciphertext. If you want the plaintext back, you can decrypt it.
When it comes to hashing, you can encrypt the plaintext, but you cannot decrypt it.
Know that Quantum computing uses Shor's algorithm. This algorithm quickly solves integer factorizations, discrete logarithms, as well as elliptic-curve discrete logarithms. It can factorize numbers much faster than other algorithms. When it comes to RSA, if the prime number factorization is resolved, RSA encryption gets failed and allows attackers to access the data easily. In short, quantum computing will definitely affect the future of RSA.
When it comes to side-channel attacks, attackers observe the computation time, power consumption, and other characteristics of the systems where the algorithms are running. Besides, the attackers may have some inputs and features of the algorithms with which they try to crack the keys.
Blinding is used to prevent side-channel attacks made on asymmetrically encrypted messages. It is essential to note that we can avoid this attack by adding one-off values while encrypting the information.
Generating a public key is much simpler than creating private keys. Not only that, public keys allow digital signatures, which in turn simplifies authentication.
Generally, the ESA encryption process consumes a higher level of computing resources. When we use the extended Euclidean algorithm for RSA encryption, it avoids negative integer operations. As a result, there is a significant reduction in the complexity and computing resources required for RSA encryption.
We can generate RSA keys using two methods, known as the Cryptomath method and the Rabin Miller method.
As you know, the RSA algorithm works based on the concept that the prime numbers must be tough to factorize. If the size of the prime number is large, then the keys generated will be so strong. And the keys must be between the size of 1024 to 2048 bits. The following method will help you to create large-sized prime numbers.
Well! We hope that now you will be able to crack your RSA interviews with courage and confidence. This blog covered all about cryptography, algorithms, encryption, decryption, and many more. We advise you to read the RSA interview questions and answers frequently to keep your knowledge fresh and green. It would help you to attend RSA interviews and deliver answers sharply. We wish you the best of luck for your success and colorful career.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .
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