I have created an advanced version of the simple substitution cipher.
It can now use chars in range from 0-255, but that should not stop you.
The ciphertext is in the language of this text, and uses correct punctuation and case-sensitivity.

FE D8 FF E7 88 70 13 4B A7 70 13 6D D8 FF 8C 95
44 6B 77 6D 8C 44 D8 FF 06 44 90 70 8C 44 77 70
88 85 06 88 EA 44 6E 4B 13 44 0F D8 4B 44 E7 D8
13 44 6D 13 95 44 31 06 88 0F 44 90 06 A7 A7 44
85 D8 FF 06 44 11 06 A7 A7 D8 90 44 77 70 F5 86
06 88 95 44 6B 77 06 44 80 88 D8 6E A7 06 6C 44
90 6D 13 77 44 13 77 6D 8C 44 F5 6D 80 77 06 88
44 6D 8C 44 13 77 70 13 44 13 77 06 44 86 06 0F
44 6D 8C 44 80 88 06 13 13 0F 44 A7 D8 FF E7 95
44 9C 44 90 6D A7 A7 44 F5 D8 6C 06 44 4B 80 44
90 6D 13 77 44 70 44 6E 06 13 13 06 88 44 06 FF
F5 88 0F 80 13 6D D8 FF 44 8C 77 06 6C 06 44 70
FF 0F 44 8C D8 D8 FF 95 44 62 D8 4B 88 44 8C D8
A7 4B 13 6D D8 FF 44 6D 8C C7 44 A7 06 6C E7 A7
11 77 FF A7 6C 85 77 95