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https://github.com/omidhaqi/helloworld
Hello World by Caesar Cipher
https://github.com/omidhaqi/helloworld
cpp dart
Last synced: about 2 months ago
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Hello World by Caesar Cipher
- Host: GitHub
- URL: https://github.com/omidhaqi/helloworld
- Owner: OmidHaqi
- License: mit
- Created: 2024-05-28T20:58:28.000Z (8 months ago)
- Default Branch: main
- Last Pushed: 2024-05-28T21:43:37.000Z (8 months ago)
- Last Synced: 2024-05-29T11:46:46.902Z (8 months ago)
- Topics: cpp, dart
- Language: Dart
- Homepage:
- Size: 3.91 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
- License: LICENSE
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README
# Hello World by Caesar Cipher
The Caesar Cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter a fixed number of positions down the alphabet. The method is named after Julius Caesar, who used it in his private correspondence.
## How It Works
###
To encrypt a message, each letter in the plaintext is shifted a certain number of places down the alphabet. For example, with a shift of 3:
- `A` becomes `D`
- `B` becomes `E`
- `C` becomes `F`
- ...
- `X` becomes `A`
- `Y` becomes `B`
- `Z` becomes `C`
Non-alphabetic characters are not changed.
### Decryption
Decryption is performed by shifting letters in the opposite direction. With a shift of 3, for example:
- `D` becomes `A`
- `E` becomes `B`
- `F` becomes `C`
- ...
- `A` becomes `X`
- `B` becomes `Y`
- `C` becomes `Z`
Non-alphabetic characters remain unchanged.
## Example
Let's take the message "Hello, World!" and encrypt it using a shift of 3.
### Encryption
Original: `Hello, World!`
1. `H` shifts to `K`
2. `e` shifts to `h`
3. `l` shifts to `o`
4. `l` shifts to `o`
5. `o` shifts to `r`
6. `,` remains `,`
7. (space) remains (space)
8. `W` shifts to `Z`
9. `o` shifts to `r`
10. `r` shifts to `u`
11. `l` shifts to `o`
12. `d` shifts to `g`
13. `!` remains `!`
Encrypted: `Khoor, Zruog!`
### Decryption
To decrypt the message "Khoor, Zruog!" with a shift of 3:
1. `K` shifts to `H`
2. `h` shifts to `e`
3. `o` shifts to `l`
4. `o` shifts to `l`
5. `r` shifts to `o`
6. `,` remains `,`
7. (space) remains (space)
8. `Z` shifts to `W`
9. `r` shifts to `o`
10. `u` shifts to `r`
11. `o` shifts to `l`
12. `g` shifts to `d`
13. `!` remains `!`
Decrypted: `Hello, World!`
## Usage
The Caesar Cipher can be implemented in various programming languages. The key aspect is to ensure that the shifting logic correctly handles both encryption and decryption, and that non-alphabetic characters are preserved in their original form.