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Assignment 7B: Caesar Cipher. One of the simplest methods to encrypt a message is to "shift" the letters by a literal value. For example, if we take the letter 'A' and shift it by 2, we get 'C'. This "substitution cipher" gets its name from the Roman emperor Julius Caesar, who was one of the first person known to encode secret messages this way. For this assignment, you will 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 integer entered by the user. The method should return "true" if the offset is between 0 and 26 inclusively and the message contains only letters and spaces. If it fails either criteria, it should return "false". If the validation method returns true, a second encryption method should be called. This method also takes in the message (as a string) and the offset integer entered by the user. It should convert the message to UPPERCASE, encrypt every letter in the message, and leave the spaces as they were. It should then return the encrypted message. Hint: The computer treats chars like integers in many ways, meaning you can add and subtract numbers from them. A string is really an array of chars, and there are methods in each language to get chars out of the string. Hint: What happens if our offset makes the letter go past 'Z'? There are several ways to deal with this - we can either use the modulus operator creatively, or use a loop to add the offset value one at a time. In the latter case, if the letter becomes greater than 'Z' (note the single quotes), we can reset it back to 'A' and keep going.

Assignment 7B: Caesar Cipher. One of the simplest methods to encrypt a message is to "shift" the letters by a literal value. For example, if we take the letter 'A' and shift it by 2, we get 'C'. This "substitution cipher" gets its name from the Roman emperor Julius Caesar, who was one of the first person known to encode secret messages this way. For this assignment, you will 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 integer entered by the user. The method should return "true" if the offset is between 0 and 26 inclusively and the message contains only letters and spaces. If it fails either criteria, it should return "false". If the validation method returns true, a second encryption method should be called. This method also takes in the message (as a string) and the offset integer entered by the user. It should convert the message to UPPERCASE, encrypt every letter in the message, and leave the spaces as they were. It should then return the encrypted message. Hint: The computer treats chars like integers in many ways, meaning you can add and subtract numbers from them. A string is really an array of chars, and there are methods in each language to get chars out of the string. Hint: What happens if our offset makes the letter go past 'Z'? There are several ways to deal with this - we can either use the modulus operator creatively, or use a loop to add the offset value one at a time. In the latter case, if the letter becomes greater than 'Z' (note the single quotes), we can reset it back to 'A' and keep going.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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**Assignment 7B: Caesar Cipher** One of the simplest methods to encrypt a message is to "shift" the letters by a literal value. For example, if we take the letter ‘A’ and shift it by 2, we get ‘C’. This "substitution cipher" gets its name from the Roman emperor Julius Caesar, who was one of the first people known to encode secret messages this way. For this assignment, you will 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: - **Validation Method:** This method takes in the message (as a string) and the offset integer entered by the user. The method should return “true” if the offset is between 0 and 26 inclusively and the message contains only letters and spaces. If it fails either criteria, it should return “false”. - **Encryption Method:** If the validation method returns true, a second encryption method should be called. This method also takes in the message (as a string) and the offset integer entered by the user. It should convert the message to UPPERCASE, encrypt every letter in the message, and leave the spaces as they were. It should then return the encrypted message. **Hint:** The computer treats chars like integers in many ways, meaning you can add and subtract numbers from them. A string is really an array of chars, and there are methods in each language to get chars out of the string. **Hint:** What happens if our offset makes the letter go past ‘Z’? There are several ways to deal with this – we can either use the modulus operator creatively, or use a loop to add the offset value one at a time. In the latter case, if the letter becomes greater than ‘Z’ (note the single quotes), we can reset it back to ‘A’ and keep going.
Transcribed Image Text:**Assignment 7B: Caesar Cipher** One of the simplest methods to encrypt a message is to "shift" the letters by a literal value. For example, if we take the letter ‘A’ and shift it by 2, we get ‘C’. This "substitution cipher" gets its name from the Roman emperor Julius Caesar, who was one of the first people known to encode secret messages this way. For this assignment, you will 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: - **Validation Method:** This method takes in the message (as a string) and the offset integer entered by the user. The method should return “true” if the offset is between 0 and 26 inclusively and the message contains only letters and spaces. If it fails either criteria, it should return “false”. - **Encryption Method:** If the validation method returns true, a second encryption method should be called. This method also takes in the message (as a string) and the offset integer entered by the user. It should convert the message to UPPERCASE, encrypt every letter in the message, and leave the spaces as they were. It should then return the encrypted message. **Hint:** The computer treats chars like integers in many ways, meaning you can add and subtract numbers from them. A string is really an array of chars, and there are methods in each language to get chars out of the string. **Hint:** What happens if our offset makes the letter go past ‘Z’? There are several ways to deal with this – we can either use the modulus operator creatively, or use a loop to add the offset value one at a time. In the latter case, if the letter becomes greater than ‘Z’ (note the single quotes), we can reset it back to ‘A’ and keep going.
**Sample Output:** 1. **Enter your message:** `KSU Class of 2025!` 2. **Enter the offset value:** `14` *Sorry, we can only process messages with letters and spaces, and the offset must be between 0 and 26.* 3. **Do you want to encrypt another message?:** `Y` 4. **Enter your message:** `First Year Experience at KSU` 5. **Enter the offset value:** `13` *Your secret message is...* `SVEFG LRNE RKCREVRAPR NG XFH` 6. **Do you want to encrypt another message?:** `n` *Closing out...* --- **Explanation:** The sample output illustrates a simple encryption process using the Caesar Cipher technique. The user is prompted to input a message and an offset value, with the requirement that the offset must be between 0 and 26. The first entry is rejected due to the presence of non-letter characters. The second message is successfully encrypted with an offset of 13, displaying a secret message in uppercase letters.
Transcribed Image Text:**Sample Output:** 1. **Enter your message:** `KSU Class of 2025!` 2. **Enter the offset value:** `14` *Sorry, we can only process messages with letters and spaces, and the offset must be between 0 and 26.* 3. **Do you want to encrypt another message?:** `Y` 4. **Enter your message:** `First Year Experience at KSU` 5. **Enter the offset value:** `13` *Your secret message is...* `SVEFG LRNE RKCREVRAPR NG XFH` 6. **Do you want to encrypt another message?:** `n` *Closing out...* --- **Explanation:** The sample output illustrates a simple encryption process using the Caesar Cipher technique. The user is prompted to input a message and an offset value, with the requirement that the offset must be between 0 and 26. The first entry is rejected due to the presence of non-letter characters. The second message is successfully encrypted with an offset of 13, displaying a secret message in uppercase letters.
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