# What is Encryption?

Encryption is a method for scrambling information with the goal that solitary approved gatherings can comprehend the data. In specialized terms, it is the way toward changing over plaintext to ciphertext. In less difficult terms, encryption takes decipherable information and adjusts it so it seems irregular. Encryption requires the utilization of an encryption key: a lot of numerical qualities that both the sender and the beneficiary of an encoded message know.

Fundamental types of encryption might be as basic as exchanging letters. As cryptography propelled, cryptographers included more advances, and decoding turned out to be increasingly troublesome. Haggles would be joined to make complex encryption frameworks. PC calculations have now supplanted mechanical encryption.

# How Encryption Works

Encryption utilizes calculations to scramble your data. It is then transmitted to the accepting party, who can interpret the message with a key. There are numerous kinds of calculations, which all include various methods for scrambling and afterwards unscrambling data.

Practically speaking, when you communicate something specific utilizing an encoded informing administration (WhatsApp for instance), the administration encloses the message by code, scrambling it and making an encryption key. It can then just be opened by the beneficiary of the message.

Advanced encryption is incredibly entangled and that is the reason it is considered difficult to split. To reinforce that insurance, another arrangement of encryption calculations is made each time two cell phones start speaking with each other.

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# How are Encryption Keys Triggered?

Keys are normally created with irregular number generators or PC calculations that copy arbitrary number generators. A progressively perplexing way that PCs can make keys is by utilizing client mouse development to make extraordinary seeds. Current frameworks that have forward secrecy involve producing a new key for each session, to include another layer of security.

**Key**

An irregular series of bits made explicitly for scrambling and unscrambling information. These are utilized to scramble and additionally decode information. Each key is exceptional and made by means of the calculation to ensure it is capricious. Longer keys are more earnestly to split. Normal key lengths are 128 bits for symmetric key calculations and 2048 bits for open key calculations.

**Cipher**

An algorithm used for encryption or decryption. It is a set of steps that are followed as a procedure to encrypt information. There are two main types of ciphers: (i) Block Ciphers and (ii) Stream Ciphers.

**Algorithm**

A calculation is a methodology that the encryption procedure pursues. The particular calculation is known as the cipher or code. There are numerous kinds of encryption calculations. The encryption’s objectives and level of security decide the best arrangement. Triple DES, RSA and Blowfish are a few instances of encryption calculations or ciphers.

**Frequency Analysis**

A procedure used to break a cipher. Those attempting to decode a message will think about the recurrence of letters or gatherings of letters in a ciphertext. Since certain letters happen more regularly than others, the recurrence of letters can uncover portions of the scrambled message. While this technique was successful in splitting old encryption strategies, it is ineffectual against present-day encryption.

Encryption keys are generated using a random number generation or using computer algorithms that can generate random numbers. There are many different techniques used to generate the Encryption Keys. Modern Computers generate a fresh key for every session so as to add an extra layer of security to the encryption.

# Need for Encryption

Encryption is the method of protecting your messages or data and making it confidential as it is shared over the Internet. When you send personal information like bank details, passwords, credit cards etc then without encryption one can easily retrieve your data and misuse it. Therefore we use Encryption to keep our data confidential and protected. As shown below when a message is sent from Senders to Receiver it can be tapped by a hacker but with encryption, the hacker is not able to read the data as it is the encrypted format. This is how the encryption keeps the data confidential and secure.

# Types of Encryption

The two main kinds of encryption are Symmetric Encryption (Private-Key Encryption) and Asymmetric Encryption (Public-Key Encryption).

## Symmetric Encryption (Private Key Encryption)

* Private key encryption* is the form of encryption where only a single private key can encrypt and decrypt information. It is a fast process since it uses a single key. However, protecting one key creates a key management issue when everyone is using private keys. The private key may be stolen or leaked. Key management requires prevention of these risks and necessitates changing the encryption key often, and appropriately distributing the key.

### When is Symmetric Encryption useful?

It is most useful in situations where the same user encrypting the data is decrypting it. For example, in the case of Cloud Storage Services, the data is uploaded by the user and is also accessed later by himself.

### Some of the Most Secure Type of Symmetric Encryptions

**FPE (Format-Preserving Encryption)**

FPE is the process of encryption in which the input and the encrypted data is in the same format. For example in the case of Credit Cards and Debit Cards the card number composed of 16 digits from 0 to 9 will remain is the same format and will be encrypted as another 16 digits from 0 to 9.

**AES (Advanced Encryption Standard)**

AES method was first established by the U.S. National Institute of Standards and Technology in 2001. It is used by the U.S. Govt to protect their classified data and many hardware and software also use AES. AES consists of AES-128, AES-192 and AES-256. The key bits you select to encrypt the data blocks into the format of the selected bit. AES is most effective in AES-128 bit format. AES is mostly impenetrable to attacks except for the brute force attack where all possible combinations of 128, 192 and 256-bit format are applied to decipher the message.

**3DES (Triple Data Encryption Standard)**

3DES was the recommended standard and was the most widely symmetric algorithm in the industry. 3DES used 3 individual keys with the 56-bit format in its encryption algorithm.

**Twofish**

Twofish is the symmetric algorithm based on the earlier used algorithm Blowfish. It was originally designed by Bruce Schneier. Twofish uses a block size of 128 bits and 256 bits for encryption. It works perfectly on smaller CPUs and is also free of licensing and copyright.

## Asymmetric Encryption (Public Key Encryption)

* Public-key encryption* is a cryptographic system that uses two keys — a public key known to everyone and a private or secret key known only to the recipient of the message. Example: When John wants to send a secure message to Jane, he uses Jane’s public key to encrypt the message. Jane then uses her private key to decrypt it.

In this process of encryption, the encrypting key and decrypting key are different as the name also suggests i.e. they are asymmetric. In this method the encrypting key and decrypting keys are different. The Public and Private Key Pairs are used in Asymmetric Encryption. A Private key is used to encrypt the data and a shared public key is used to decrypt the same data. Asymmetric Encryption is commonly used in website certificates that can validate whether a connection is from a secure source.

### Most used type of Asymmetric Encryption

**RSA (Rivest-Shamir-Adelman)**

RSA is named after Ron Rivest, Adi Shamir and Len Adelman, which was first released in 1978. RSA is the most widely used asymmetric algorithm. In RSA two types of keys are used: one Public and one Private. You use one of the keys to encrypt the data and another to decrypt the data. In RSA the key size is large i.e. 1024 and 2048 bit long keys. The longer bit of keys does not affect the speed of encryption as compared to other methods of encryption.

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