It's more a theoretical question of how would you approach it. All you know about the ciphertext it's was generated with a historical cipher. The ciphertext appears to be random, BUT it's divided into sets of six letters. By historical ciphers I mean: mono (Ceasar), polyalphabetic (Vigenere), homophonic or polygraphic ciphers (Playfair, HillCipher).
I interested what methods would you use (Kasiski, Friedman, what else) and why and in what order to make the attack the most efficient (Friedman first?)