You discover a message that appears random, but you notice it's exactly 230 characters long and comes in six segments of 23 characters each, with different statistical profiles. The first segment has very low index of coincidence (near 0.038). The other five segments each have index of coincidence around 0.065. All segments show English-like letter frequency distributions when analyzed separately within each segment's position groups. As a codebreaker, what type of cipher is this likely to be, and how would you proceed to decrypt it?