nightshiba / caesar-utils

Encrypt and decrypt Caesar's cipher efficiently

Caesar utils

Description

Customizable Caesar cipher encrypting/decrypting CLI tool written in C. Supports custom dictionaries, finding the correct variant by the known part of a string (implemented using Levenshtein distance and Wagner-Fischer algorithm).  

Usage

usage: ./caesar-utils [-h] [-sae] [-c] [-v]

default: decode Caesar cipher knowing original message with some replaced symbols.
-s Decode Caesar cipher knowing substring of the original string.
-e Encrypt text at offset n.
-c Use custom alphabet (default: a-Z0-9).
-a Print all the possible variants.
-h Print this message.
-v Print debug information.

 

Download && Build

git clone https://github.com/nightshiba/caesar-utils
cd caesar-utils
cmake .
make

 

Run tests

chmod +x test.sh
./test.sh

 

Examples

• ./caesar-utils

Enter the encrypted string:
efbecffg
Enter the corrupted original string:
somebeef

-> deadbeef

 

• ./caesar-utils -a -c

Enter the custom alphabet:
1234
Enter the encrypted string:
23

->

23
34
41
12

 

• ./caesar-utils -s

Enter the encrypted string:
mkoCkB
Enter the corrupted part or substring of the original string:
aes

-> caesar

 

• ./caesar-utils -e -c

Enter the custom alphabet:
abcdefghijklmnopqrstuvwxyz
Enter the original string to encrypt:
secret
Enter shift offset:
2

-> ugetgv

 

License

• MIT