What Is the Purpose of Encryption?

There is a lot to learn about encryption, and as this article will just cover the basics, we won’t spend too much time doing so.

However, in a nutshell, encryption scrambles data you wish to keep private, rendering it unintelligible to anybody without the private key to decrypt it.

There are a variety of methods for doing this, but some, including such AES, use what’s known as a “symmetric cipher,” that authenticates and encrypts material using the same keys.

Asymmetrical encryption, in contrast to encryption process, encodes information using a publicly known key. Nevertheless, it must be decrypted once again using a hidden secret key.

Prior proceeding, you may want to read our general overview of encrypting for an in-detail discussion of the fundamentals.

AES’s Background

Because it was selected by the United States National Institute of Standards and Technology as that of the professional norm for cryptography, AES is commonly termed as “Advanced Encryption Standard”.


It was one of 14 systems presented to NIST for evaluation as the next industry norm for decryption, such as the four and ultimately go ahead to contend against Rijndael: notably, Twofish, Viper, Symmetric key and MARS. NIST declared Rijndael the victor following consecutive meetings in 1998, 1999, and 2000, and it would have been recognized as AES going forward.

Encryption with AES-256

Another widely employed and very safe encryption technique is the AES. The NSA employs this cypher to secure data classified as “highly classified,” and it is open to the world. In 1997, NIST began formally searching for a replacement to the outdated DES encryption system. This was the beginning of its big success.


In 2001, it triumphed over a number of rivals to become the data encryption system AES. Each data frame of 16 bytes is subjected to a different set of replacements, permutation, and address the objectives, which are all carried out on the same block of data in turn. “Cycles” refer to the number of rounds certain procedures are performed.

The secret key is used to generate a unique rounds key, which is then used in the computations throughout each round. With AES, a 1-bit alteration in the secret or unencrypted block resulting in entirely new ciphertexts, giving it an unique advantage over more typical streaming cyphers. AES’ block architecture When comparing AES-128, DES-192, and AES-256, the only real variation is in the key size.

These are all significant enhancements over DES’s 56-bit key key. To give you an idea of how long this would require to break a 128 Bits key using today’s best technology, consider this. 256-bit keys are even used by Boxcryptor. AES has yet to be attacked in a way that is both practical and effective. As a result, authorities, companies, and other elevated institutions throughout the globe continue to adopt AES as their chosen encryption system.

RSA Cryptography

Among the most used asymmetrical encryption methods nowadays is RSA, which is based on the RSA cryptographic algorithm. It was classified as “top secret” when it was first found by the Britain spy organisation GCHQ in 1973. While working on another cryptography issue, cryptologists came into it by accident.

RSA utilises two keys instead of one like previous symmetrical encryption schemes. A communication encoded with another one of these could only be decoded by the other, since they are complimentary. Due to the fact that the private key can’t be derived from either the key pair, anybody may use it.

Such characteristics allow the use of asymmetric cryptographic protocols in a variety of applications, including digital signatures. When a document is signed, an RSA-encrypted fingerprint is added to it, allowing the recipient to validate the author and the statement’s integrity all at once.

The theoretical issue of numerical methods lies at the heart of RSA’s protection. Before it’s encrypted, a communication is just a big number. Whenever a message is encrypted, it is multiplied by the key and then split by a predetermined combination of two positive integers.

The text may be recovered again by using the other key and repeating the procedure. For the time being, the most effective way to decrypt the data is to factorise the encryption’s output. Numbers with more than 768 bits cannot be factored at this time. As a result, current cryptography employs a 3072-bit maximum key size.

AES versus RSA: The Encryption War


A more well encryption technique is RSA. Because it employs an asymmetric cryptographic model instead of an asymmetrical one, RSA becomes considerably greater secured than AES, an abbreviation for its 3 creators.

It raises the question, therefore, why do we even utilize AES when there is RSA available that is much safer. RSA takes substantially more computer power that AES and as like is not ideal for situations wherein efficiency and reliability are crucial, since the solution is clear enough to explain.

This is an appropriate encryption technique for technology and the software that needs to swiftly and effectively encrypt or decrypt data while having to compromise on safety due to the comparatively low performance expectations of the block cipher.

Also check our article “WhatsApp rolls out total ‘end-to-end encryption’ for all the platforms

Attacks Using Multiple Related-Keys

A “related-key attack” is one approach to take advantage of an AES algorithm that has been improperly designed. Attackers may perform this sort of attack if they can connect the public key they know to the appropriate super secret key, and then decode the data using that key. However, if indeed the AES-key creation is effectively done, this attacking technique will be rendered ineffective.

Attacks from the Side Channels

There are electromagnetic breaches in systems that may be detected by scanning for actual electromagnetic leakage. If indeed the secret key is leaked, the attacker may be able to decode the information as if they’re the authorized recipient.

Deterministic Attacks that Use as Known Key

Probably the easiest to grasp is a known-key attack, which necessitates the attacker having access to the encryption key. In order to decrypt encrypted files, an assailant must compared to other encrypted files whose values are available to him.

AES utilises 10 pieces of cryptography, therefore even the smallest key size (128-bit) is safe from this attack since it only works against the first total amount of AES. Furthermore, it’s quite unlikely that an attacker will have access to the initial key.

Attacks on the Recovery of Lost or Stolen Keys

It is possible for an intruder to determine the key is used for encryption data via a key-recovery operation if they have access to encoded and decrypt content. Because it’s just 4 times as quick as a brute-force assault, they’d now have to invest thousands of years in developing it.

Problems with AES’s Security

So, although AES is a fairly secure encryption scheme, there are certain potential flaws to be considered.


Brute-force assaults may not be able to break AES encryption because of its complexity; nevertheless, a badly designed version of AES might be used in more sophisticated attacks.

Concluding Thoughts on AES Cryptography

Hopefully by the time you’ve finished reading this guideline, you have a better understanding as to what AES algorithm is. It’s okay if you’re still a little perplexed, since encryption is a fundamentally complicated subject that needs years of education to fully grasp.

What do you think now that you’ve read about how the protocols secures your information? Or are you still baffled? Please let us know what you think in the commenting section below, and we appreciate your time.