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CN Lab Ex12

The document describes an algorithm for implementing a Caesar cipher encryption and decryption program. It involves: 1. Defining an array to store the message and an integer key value. 2. Looping through each character, shifting it based on whether it is a letter or number using the key, and storing it back in the array. 3. Printing the encrypted or decrypted message based on whether it is encryption or decryption. The program takes a message and key as input, encrypts or decrypts the message by shifting each character, and outputs the result.

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59 views4 pages

CN Lab Ex12

The document describes an algorithm for implementing a Caesar cipher encryption and decryption program. It involves: 1. Defining an array to store the message and an integer key value. 2. Looping through each character, shifting it based on whether it is a letter or number using the key, and storing it back in the array. 3. Printing the encrypted or decrypted message based on whether it is encryption or decryption. The program takes a message and key as input, encrypts or decrypts the message by shifting each character, and outputs the result.

Uploaded by

Kesavan Phoenix
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Ex.

No:(2
Date: os/o/3023
Caescun cipher

Aim:
inplement Caegan cipher adgorithm for
encphion and decryphon wing e progran
decrgphon
Algorithm :
Step i: Dedane a chanacten aay StrC1oo] .
Step 2: Declane ninteger k koy vauo
in
Step 3: Read the mes age and eey
Step 4: set up a Loop from o to lengtk of

|Step s: check ie the chaacter is alpha or number

ch =(ch- a' +ka 426).26 +^a


) ebe ie he chaeter upp letter
ch (eh- 'A' kay ) 2b t A
ii) ele if the charaeten is a nunben

h= (ch - o' 4key e (o + 1o'


8tep b:
Otheuoihe prunt Mesage.
Finally prìnt the erenypied mesge.
Step &: Set up a for lop fom o to length of sr.
or nunter
check ie the chanacten is alpha bmall
Step q: ijcheck ie the chaacten s lettey
h= (ch-'a'-k +26) 2b +a
seplo i) ele i the chanacten is ugpey ease lette
ch=(ch- 'A'- k +26) . eb + A!
ii) ele p the chanacter s anunbey
yZ4sN ag:e meDeevypt
s ed
eFw¥T mes
:age Erevypted
key the Entei
yz8N encrypt: to
message Enter
a
Output
Step (o. othenwise print as huald Message

step l: Finaly print the Þecngted mesage.


Program:
# include Kstdio. h>
# inelude <stdlib.h
#incude <shingh
inb manC)

chan str Cioo], eh


nt K
prìntf (" Enten a mesage to enerypt
;");
Scanpls" str);
printfl Enten she
Seanp ("d d", sk); int Q= strlen(str);
forl int i=0 i< l; i+4)
ch= stCiJ:

ig Ciclowen Cch)
'a';
ch= Cch- 'a' +k)/ 28 +
else if (isupper (ch))
eh- (ch-'A+*)-24 + 'A';

ch=Cchlo'+ K) 1o +o';
3
3
else
printf "Invalid mesage");
styi}=ch;

Print e" Encrypted meuage : /"s",str).


for(int is0 ,i<l;i++)

ch= strCiJ;
ie (isalhum Cch))
ip (isloweteh))
Cch- a' key +26)- 26 + 'a'3
eh-
ebe ie Cisupper Cch))
Ceh-a'- key t2b) t.26 + 'A';
ch=
else if lis digit (ch))
che(ch-'o'-k+10) to o;

ese
printp ("INalid mesage
sbrCiJ = ch;
3
("oecvypted meuage : s", st);
Printy
3

Tine Viva Total


Problem Tmplementation management
Ci) (5)
Undestonding Coo) (o)
Qo)

Resuf:
Hence Cprogam for inplementahion q4
was
Causan cphen
exeauted
fon eranghion and decgtion
Buecepully d output was Nepied.

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