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|ROT13 should get input and give output in alphabetic characters (a-z,A-Z) in your code if al>97 al+13 is not alphabetic. It should be checked if al+13 exceeds a limits (97 or 7F in this case) if so
will do the job, i think.
|ROT13 cipher might be implemeted like below as stated:
;si: string to encrypt
lodsb;load a byte from esi
or al,al;is it NULL
jz .exit;if so then exit
jl .savec;if lessthan A , pass it as it is
;here al is between A and Z
cmp al,'Z';is it between?
jle .savec;if not
sub al,26;make it between
jmp .savec;save character
.sec:;a-z check whose steps are very similar
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