Introduction 

The protection of information, particularly with modern communications networks, has become an enormous factor, leaving gaps to be used for destruction. The below article mentioned the two most popular encryption techniques that are used to improve communication security in Symmetric and Asymmetric Encryption forms. In theory, the easiest way to launch this conversation is to start with the fundamentals first. Thus, we look at the meanings of algorithms and essential cryptographic principles and then plunge into the heart of the debate where we present a summary of the two strategies.

Cryptography is the practice of the encoding and decoding of hidden messages. Cryptographic methods have been used for thousands of years, long before the invention of computers, and techniques have developed since then. More recently, with the introduction of electronics and later computer science, it was possible to introduce more sophisticated encryption methods focused on complicated mathematical equations. Let us distinguish between a symmetric key and asymmetric key cryptography.

  1. What is symmetric and asymmetric key cryptography?
  2. What is the difference between symmetric key cryptography and asymmetric key cryptography?
  3. What are the advantages and disadvantages of symmetric and asymmetric key cryptography?

1. What is symmetric and asymmetric key cryptography?

Encryption is a mechanism to change the form of any text in order to prevent it from being read by others. In Symmetric-key encryption, the message is then encrypted using a key and with the same key, the messages can be decrypt, making it simple to use but less safe. It also needs a secure way of moving the key from one party to another.

Asymmetric Key Encryption is for both for public and private key encryption strategy. It uses separate keys to encrypt and decrypt a message or document. It is more reliable than the symmetric key encryption method, but it is very slower.

There are terms of cryptography and those are :

Encryption: the method of locking cryptographic information. This way locked information is encrypted.

Decryption: An unlocking process of the cryptographically encrypted details.

Key: A secret like a password used to encrypt information and decode it. In cryptography, there are a variety of different kinds of keys used for Encryption and Decryption.

Steganography: It is the science of concealing information from people who are snooping at you. The distinction between steganography and coding is that the desired snoopers will maybe not state first of all that there are secret details.

Data Encryption Standard (DES): The most common symmetric key algorithm is the Python and the DES as it contains a service that provides the logic behind DES algorithm.

2. What is the difference between symmetric key cryptography and asymmetric key cryptography?

When interacting on an unsecured medium such as the Internet, you need to be vigilant about the confidentiality of information that you exchange with others. There are two methods used to protect the secrecy of the text or message, symmetric and asymmetric key cryptography. The basic difference between symmetric and asymmetric key cryptography is that symmetric encryption requires the same key to be encrypted and decrypted.

In the other hand, asymmetric encryption uses a key for encryption and uses another key for decryption. To understand any more variations have a look at the difference between symmetric and asymmetric key cryptography in tabular form.

SYMMETRIC KEY CRYPTOGRAPHYASYMMETRIC KEY CRYPTOGRAPHY
It is also known as secret-key cryptography as the encryption and decryption process uses the same key.It is also known as public-key cryptography. It works in the opposite way of symmetric cryptography.
A single key for both decryption and encryption.Two key are required in which one key will encrypt and the other one used to decrypt.
The size of the cypher text is smaller or same.The size of the cypher text is larger or same.
The encryption process is very extremely fast.The encryption process is too slow.
It can transfer a huge amount of data.It transfers only a small amount of data.
Symmetric key cryptography provides confidentiality.It provides both authenticity and confidentiality.
Examples: AES, DES, 3DES and RC4Examples are ECC, El Gamal, Diffie-Hellman, DSA and RSA
 In comparison, resource utilization is low than asymmetric key encryption.Resource utilization is higher.

The major differences between the symmetric key and asymmetric key cryptography are mentioned and with this let us also compare symmetric and asymmetric key cryptography:

COMPARISONSYMMETRIC KEY CRYPTOGRAPHYASYMMETRIC KEY CRYPTOGRAPHY
BasicSymmetric encryption uses a single key.Asymmetric encryption uses a different key for encryption and decryption.
PerformanceSymmetric encryption is faster in execution.Asymmetric Encryption is slow in execution.
AlgorithmsDES, 3DES, AES, and RC4.Diffie-Hellman, RSA.
PurposeSymmetric encryption is used for bulk data transmission.Asymmetric encryption is often used for securely exchanging secret keys.

3. What are the advantages and disadvantages of symmetric and asymmetric key cryptography?

The encryption algorithm is being created to recover eavesdroppers and to boost confidentiality by safeguarding information. In the next few years, hackers can find it hard for experts and thus expect more of the encrypted group! Below are some advantage and disadvantage of Symmetric and Asymmetric Key Cryptography :

1) Advantages and Disadvantages of Symmetric or Secret Key Cryptography

A) Advantages

  • Very fast encryption and message decryption
  • The broader the key code, the better the protection 

B) Disadvantages

  • Key exchange: This ensures that the encryption key is shared through a protected channel. 
  • The number of keys needed:  A new key is required for each pair of participants wishing to exchange encrypted messages.

2) Advantages and Disadvantages of Asymmetric or Public Key Cryptography

A) Advantages

  • Security is simple because only the private key must be kept hidden.
  • Maintenance of the keys makes it possible to keep the keys (public key/private key) constant by contact based on the relation.
  • Less is the number of keys to be kept hidden.

B) Disadvantages

  • This is not sufficient for the encryption of large messages as the encryption/decryption throughput is inversely proportional to the duration of the key.

Conclusion 

As a simple and fast encryption method, asymmetric encryption is commonly used to exchange passwords, and symmetric encryption, which is a faster technique, is used for bulk data transfer. Hope the above differences and comparison between symmetric key cryptography and asymmetric key cryptography have clear your concept. 

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