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Source code:$-$

#include

#include

#include

#include

void UART$\_$Init$()$

$\{$

TMOD $|=0$x$20$; $//$ Timer$1$ in mode $2($auto$-$reload$)$

TH$1=0$xFD; $//$ Set baud rate to $9600($for a $12$ MHz crystal$)$

SCON $=0$x$50$; $//8-$bit UART, enable receiver

TR$1=1$; $//$ Start timer$1$

$\}$

char UART$\_$ReadChar$()$

$\{$

while$(!$RI$)$; $//$ Wait until character is received

RI $=0$; $//$ Reset receive interrupt flag

return SBUF; $//$ Return received character

$\}$

void UART$\_$SendChar$($char c$)$

$\{$

SBUF $=$ c; $//$ Send character via UART

while$(!$TI$)$; $//$ Wait until character is sent

TI $=0$; $//$ Reset transmit interrupt flag

$\}$

void UART$\_$SendString$($char$*$ str$)$

$\{$

while$(*$str $!=\text{'}\backslash 0\text{'})$

$\{$

UART$\_$SendChar$(*$str$)$; $//$ Send character via UART

str$++$; $//$ Move to next character in string

$\}$

$\}$

void main$()$

$\{$

char input$[10]$;

char c;

int i $=0,$ len $=0$;

char password$[]=$ "kuastha";

UART$\_$Init$()$;

while $(1)$

$\{$

int i $=0,$ len $=0$;

UART$\_$SendString$("$Enter password:

$")$;

do

$\{$

c $=$ UART$\_$ReadChar$()$; $//$ Read character from UART

if$($c $==\text{'}\backslash$r$\text{'})//$ Ignore carriage returns

continue;

if$($c $==\text{'}\backslash$b$\text{'})//$ Handle backspaces

$\{$

if$($i $>0)$

$\{$

i$--$;

UART$\_$SendChar$($c$)$;

UART$\_$SendChar$(\text{'}\text{'})$;

UART$\_$SendChar$($c$)$;

$\}$

continue;

$\}$

input$[$i$]=$ c; $//$ Store character in string

UART$\_$SendChar$($c$)$; $//$ Echo character back to terminal

i$++$;

$\}$ while$($c $!=\text{'}.\text{'})$; $//$ Stop when null terminator is received

input$[$i$-1]=\text{'}\backslash 0\text{'}$; $//$ Replace newline with null terminator

UART$\_$SendString$("\backslash$r

You entered: $")$;

UART$\_$SendString$($input$)$;

$//$ Secured password checking algorithm

len $=$ i $-1$;

TR$0=1$; $//$ End Timer$0$

if$($len $!=$ strlen$($password$))//$ Check length of input string

$\{$

$//$ Do something if password is incorrect

$//$P$1|=0$x$00$;

TR$0=0$;

UART$\_$SendString$("\backslash$r

Incorrect password length :$(\backslash$r

$")$;

$//$return $0$;

$\}$

else

$\{$

for$($i $=0$; i $$ len; i$++)//$ Compare characters one by one

$\{$

if$($input$[$i$]!=$ password$[$i$])$

$\{$

$//$ Do something if password is incorrect

TR$0=0$;

UART$\_$SendString$("\backslash$r

Incorrect password found!$\backslash$r

$")$;

break;

$//$return $0$;

$\}$

$\}$

if $($i $==$ len$)//$ All characters match

$\{$

TR$0=0$;

UART$\_$SendString$("\backslash$r

Password accepted!$\backslash$r

$")$;

$//$ Do something if password is correct

$\}$

$\}$

$\}$

$\}$