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17 views3 pages

Program Title

Uploaded by

mi ka Sangu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Name Sandip Gangaram yedage Subject Information Security

Class T. Y B. TECH Semester 5

Roll Number 65 Batch T3

Practical No 04 Year 2024-25

❖ Program Title
Ceaser cipher analysis program.

❖ Program:
#include<stdio.h

>

#include<ctype.

h>int main()
{
char text[500], ch;

int key

printf("Enter a message to

encrypt: "); scanf("%s", text);

printf("Enter the key:

"); scanf("%d", & key);

int i;
for ( i = 0; text[i] != '\0'; ++i)
{
ch = text[i];
if (isalnum(ch))
{
if (islower(ch)) //Lowercase characters.
{
Ch = (ch - 'a' + key) % 26 + 'a';
}
if (isupper(ch)) // Uppercase characters.
{

ch = (ch - 'A' + key) % 26 + 'A';

}
if (isdigit(ch)) // Numbers.
{
ch = (ch - '0' + key) % 10 + '0';
}

else

printf("Invalid Message");

}
text[i] = ch; // Adding encoded answer.

printf("Encrypted message: %s",

text);return 0;

❖ Output

Enter a message to encrypt: GOODMORNING


Enter key: 3
Encrypted message: JRRGPRUQLQJ

Enter a message to encrypt: Today52


Enter key: 3
Encrypted message: Wrgdb52

Enter a message to encrypt: IS46@


Enter key: 3
Encrypted message: LV46@

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