Task: Text Simplification
Input (English): serpent is a symmetric key block cipher which was a finalist in the advanced encryption standard -lrb- aes -rrb- contest , where it came second to rijndael.
Output (English): the snake is a -lrb- having a left half that 's a perfect mirror image of the right half -rrb- key block calculates / codes which was a finalist in the advanced -lrb- turning messages into secret code -rrb- standard -lrb- aes -rrb- contest , where it came second to rijndael.