Program kriptografi caesar cipher dengan java

We iterate this through the input text and repeat the Step 2 for each alphabet in the text to obtain the ciphertext.Į n = ( x + n ) mod 26, where n represents shift. To encrypt the plaintext or the message we add the shift, taken as input from the user to the mapped representation of the extracted letter in the Step 1. Step 2(Encrypting and Obtaining CipherText) :

We start this by representing or transforming each letter into numbers, therefore the alphabets will be mapped to the numbers starting from 0, example, A = 0, B = 1. (We can also modify the algorithm for moving up the character it’s up to the user, in that scenario if shift equals 2, A will be replaced by Y, B will be replaced by Z, and so on.) Implementation Step 1(Mapping Plaintext) : This fixed number here indicates the shift, which means the number of positions by which each letter of the text has to be moved down. We decide that fixed number, for example, if we select that number as 2 then A will be replaced by C, B will be replaced by D, and so on. It is a simple type of substitution cipher, in this, each letter or word of a given text message is replaced by a letter some fixed number down the original alphabet. Now since we know all the related terms let’s discuss the actual algorithm of Caesar Cipher Algorithm Note : The terms are explained in the order in which they are used in cryptography. In most of the cases, the algorithms are reversible in nature, therefore in those cases, we directly apply the same encryption algorithm in a reverse way.

Decryption : It is the process by which we obtain the encrypted message or the ciphertext back to its original form.Ciphertext : It is the formatted text or says it is the scrambled form of the data after being encrypted.The encoded text or message we get after applying some set of encryption algorithms on the given plaintext, is termed as the ciphertext.Encryption : It is the process by which the given message or say plaintext is encoded using the different encryption algorithms to ensure that only authorized users or parties can decode it and access them for their use.In simple words, it is nothing but the original message we are planning to send to the end-user. Plaintext : It is text that is not formatted specially, or computed.In this article, we will discuss about one such encryption technique which is one of the earliest and easiest methods, named after Julius Caesar.īefore we discuss the actual algorithm and procedure of this technique we have to get familiar with the few terms which we might need to understand as a prerequisite to get to know the working of the technique.

Program kriptografi caesar cipher dengan java