Plaintext message : ceasar encryption algorithmĬiphertext message: fhdvdu hqfubswlrq dojrulwkp aįor each plaintext letter p in the message is substituted by ciphertext letter c with shift = k such that k takes values from 1 to 25:ĭecryption Equation p = D(c, k) = (c-k) mod 26 Example:Įncrypt the message "ceasar encryption algorithm" Plaintext Note that the alphabet is rotated such that the letter after Z is A.Įach letter in the alphabet is represented by equivalent letter such as A is assigned to 0 and Z to 25. Next table shows an example for shift = 3. It is an old encryption technique developed by Julius Ceasar for hiding the content of a message by substituting each letter in a message with a letter existing three or more places down or up in the same alphabet. If (intermediate.charAt(0)=intermediate.In this post, I will explain classical encryption techniques Ceasar cipher, Monoalphabetic cipher, and Playfair cipher and provide a java code demonstrating encryption and decryption processes for each one. Keyword=keyword.toUpperCase().replace("J","I") Private String ch="ABCDEFGHIKLMNOPQRSTUVWXYZ" ("\nDecrypting.\n\nThe encrypted text is: " + pfEncryption.getDecrypted()) ("Encrypting.\n\nThe encrypted text is: " + en) PFEncryption pfEncryption=new PFEncryption() Thus, hs becomes BP and ea becomes IMĪ Simple Java Program that implements the Playfair Cipher is given below: import The column occupied by the other plaintext letter. Otherwise, each plaintext letter in a pair is replaced by the letter that lies in its own row and With the top element of the column circularly following the last. Two plaintext letters that fall in the same column are each replaced by the letter beneath, The right, with the first element of the row circularly following the last. Two plaintext letters that fall in the same row of the matrix are each replaced by the letter to If the numbers of characters in the text is odd then add a filler letter (usually we use 'x'). Take the characters in the text(plain/cipher) and make a group of two characters. Plaintext is encrypted two letters at a time, according to the following Right and from top to bottom, and then filling in the remainder of the matrix with the remaining The matrix is constructed by filling in the letters of the keyword (minus duplicates) from left to A keyword is "MONARCHY" then the matrix will look like
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