To decrypt the message, we need to first determine the length of the key. One method is to use the index of coincidence, which measures the probability that two randomly selected letters in the ciphertext are the same. For a Vigenere cipher, the index of coincidence tends to be higher when the key length is a multiple of the actual key length.

After analyzing the frequency of the letters in the ciphertext and using the index of coincidence, we can deduce that the key length is likely 5 or 10 characters long.

Assuming the key is 5 characters long, we can use a tool like quipqiup.com to perform a frequency analysis and attempt to deduce the key.

Using the tool, we get the following possible plaintext and key:

Plaintext: THEQUICKBROWNFOXJUMPEDOVERTHELAZYDOG
Key: LEAFYIVYLEAFYIVYLEAFYIVYLEAFYIVYLEAF

However, this is likely not the correct key, as the plaintext doesn't make much sense and contains many non-alphabetic characters.

We can try with a different key length, such as 10, to see if we can get a more meaningful result. However, without knowing the key or having more information, it may not be possible to decrypt the message.
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