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When you start learning new things actually starting developein Core voila is my small intimate inciative to learn and foucs to understand core concepts related computer. In this blog you will get the information about all Cryptography algorithm, C# tutorials, .net version and code project. This blog has moved to its own domain tohttps://corevoila.in/  So leave new things, stay fit and stay healthy

This is the simplest kind of Cryptography that involves only one secret key to encrypt and decrypt information . It is also known as “Secret Key Cryptography”. Both Sender and receiver should know the key to be able to communicate securely. For Example: if Mahesh & Shalini wants to communicate using symmetric-key cryptography then both would have to devise key and use it for every communication. So Now, Mahesh encrypts his message using shared key, sends encrypted message to Shalini , then Shalini uses the same key again decrypt message to read. To demonstration symmetric-key cryptography , I will use AES ( Advanced Encryption Standard ) & .Net Framework in-build library “ System.Security.Cryptograph ” Output:

Asymmetric cryptography, also known as public key cryptography, it uses two distinct, yet related keys. One key, the Public Key, is used for encryption and the other, the Private Key, is for decryption. Let say Mahesh wants to send an encrypted message to Shalini , Mahesh will look for Shalini Public key and use it for encrypt the message before sending it. Then Shalini Can decrypt the message using her related private key. if Mahesh encrypts the message using his private key, then the message can be decrypted only using Shalini's public key, thus it will also authenticate Shalini . These encryption and decryption processes happen automatically hence no need to share the keys. Asymmetric cryptography is slower then symmetric cryptography Advantages: 1. Does not require to share key 2. Simple structure RSA is common asymmetric algorithm, I will use the same for this example. To demonstrate, I have used .Net framework in build library “System.Security.Cryptograph

Cryptography Types Cryptography categorized based on number of keys used for encryption and decryption; in this article we will discuss below three types Secret Key Cryptography - It is also call symmetric encryption where for both encryption and decryption uses same key. This is mainly used for confidentiality. Public Key Cryptography - It is also called asymmetric encryption ; this algorithm uses two key's one for encryption and one for decryption. mainly used for authentication. Hash Function - It uses to convert to text in such way that the input cannot be recoverable by using mathematical function.

In Part I , I have written code to encrypt the plain text for demonstration purpose . In this article we will use Brute Force technique to decrypt the encrypted message. Note: please make sure to read articles  Brute force and Caesar Cipher  before this article. Above code produce below  result, the above code took 17 iteration  to get the actual message.

The Caesar cipher is one of the earliest known and simplest ciphers; Created and used in 44 BC by Julius Caesar. It is a type of substitution cipher in which each letter in the plain text is 'shifted' with certain number of places in the alphabet. For example, if we right shift the alphabets by 3 char then we get the below text; So now if we encrypt the message with above "TEST MESSAGE" will show below result The encryption can be represented Mathematical, by first transforming the letters into numbers, like  A = 0, B = 1,…, Z = 25. To represent the Caesar Cipher encryption function, e(x), where x is the character we are encrypting, as: E(X) = (X+K)  (mod 26)  Where K represents key used to shift the letters in alphabets. for decryption we can use below equation  E(X) = (X-K)  (mod 26) I have written the below code which accept user input and right shift the alphabets by 9 char: Result produce by of abov