How do you crack the Vigenere Cipher?

To crack the Vigenère cipher, you can use techniques such as frequency analysis, the Kasiski examination, or the Friedman test. Start by identifying repeated segments of ciphertext to estimate the key length. Then, separate the ciphertext into groups based on the key length and analyze the frequency of letters within each group to determine the likely characters of the key. Once the key is identified, you can decrypt the ciphertext to reveal the original message.