If you can read this, very well done! This one was very tough! This message was encrypted with a Vigenere cipher using the keyword circle. You should find out about the Kasiski method on the internet, which explains a method of decrypting this type of cipher. It involves finding the number of letters between repeated blocks of letters in the ciphertext. This is likely to be a multiple of the length of the keyword. If there are enough repetitions, you might then be able to determine the length of the keyword by calculating the factors of these lengths and looking for common factors. Why not try and create your own cipher and test it on your friends now!
Keyword: circle