please write in JAVA Question 4Write two methodsencrypt(message,key) anddecrypt(message,key)to encrypt and decrypt messages with a key.You are going to use ASCII values of each character. For example, the character 'A' is encoded using thenumber 65 and 'B' is encoded using the number 66. Given a key, you will use the following method toeach letter of the message:if (OriginalChar + Key > 126) thenEncryptedChar = 32 + ((OriginalChar + Key) - 127)elseEncryptedChar = (OriginalChar + Key)For example, if the enemy uses Key = 10 then the message "Hey" would initially be represented as:CharacterASCII codeH72e101y121"Hey" would be converted to "Ro$:Encrypted H = (72 + 10) = 82 = R in ASCIIEncrypted e = (101 + 10) = 111 = o in ASCIIEncrypted y = 32 + ((121 + 10) - 127) = 36 = $ in ASCIIAfter conversion, the converted message will be circularly shifted left 2 characters. For example, themessage “Hey" will be encrypted as "$Ro" after circular shift operation. The methods encrypt anddecrypt will return the following result:encrypt("Hey", 10) → “$Ro"decrypt("SRo", 10) > "Неy"Suppose that key =17, encrypt and decrypt the following message texts. Print encrypted and decryptedmessages.msg1 = "Lost time is never found again."msg2 = "Use it or lose it."

Explanation: Include necessary header files. Create two functions. One for encryption and another…

Answered: Write two methods encrypt(message,key)…

Engineering

Computer Science

Write two methods encrypt(message,key) and decrypt(message,key) to encrypt and decrypt messages with a key.

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter8: Arrays And Strings

Section: Chapter Questions

Problem 21PE

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Substitution ciphers are encryption/decryption algorithms that replace one letter or number with another. The first attested use of a substitution cipher in military affairs was by Julius Caesar, described by him in Gallic Wars (cf. Kahn pp83-84). In caesar cipher , you replace each letter by 3rd letter on. If it is out of bound (later than Z), then round to the head (letter A) and continue the shift. For example:meet me after the toga party PHHW PH DIWHU WKH WRJD SDUWB Please write a program in Java to implement the Caesar Cipher: a. Implement the encryption algorithm. Ask the user to input one all lower case normal sentence (called plaintext) using the nextLine method, and then output the encrypted text (called ciphertext). b. Implement the decryption algorithm. Ask the user to input one encrypted sentence (i.e. ciphertext) using the nextLine method, and then output the decrypted text (i.e. plaintext).
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hello im stuck on a problem and it would be great if you could create a program that prompts the user for a message to encode,as well as an offset to encrypt it with. You will then create and use the following methods:• A validation method that takes in the message (as a string) and the offset integerentered by the user. The method should return “true” if the offset is between 0and 26 inclusively and the message contains only letters and spaces. If it failseither criteria, it should return “false”.• If the validation method returns true, a second encryption method should becalled. This method also takes in the message (as a string) and the offset integerentered by the user. It should convert the message to UPPERCASE, encryptevery letter in the message, and leave the spaces as they were. It should thenreturn the encrypted message. i attached an image of the sample output
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