Security by obscurity is lack of maturity.
That was the original sentence. I’ve converted it from text to hex using x-mac-roman encoding, obtaining:
53 65 63 75 72 69 74 79 20 62 79 20 6f 62 73 63 75 72 69 74 79 20 69 73 20 6c 61 63 6b 20 6f 66 20 6d 61 74 75 72 69 74 79 2e
