Decrypt messages encrypted with the Vigenère cipher algorithm
The Vigenère cipher is a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution. To decrypt:
If you don't know the key, you can try common keywords or use frequency analysis techniques.
The Vigenère cipher is a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution. It was invented by Blaise de Vigenère in the 16th century and was considered secure for centuries.
The cipher works by using a keyword to shift letters in the plaintext. Each letter in the keyword indicates how many places to shift the corresponding letter in the plaintext (with A=0, B=1, etc.). The keyword is repeated to match the length of the plaintext.
To decrypt, the process is reversed - the ciphertext letters are shifted back by the keyword values.