For instance , the word MI LI TA RY will always produce the same ciphertext letter in the first and third positions regardless of the keywords used .
If this is the case , then certain words will always produce single - letter ciphertext repeats .
The word MI LI TA RY will always produce the same ciphertext letter in the first and third positions regardless of the keywords used .
If this is the case , then certain words will always produce single - letter ciphertext repeats .