Encrypt the message HALT by translating the letters into n

Encrypt the message \" HALT \" by translating the letters into numbers
(via A=0,B=1,C=2,D=3,E=4,F=5,G=6,H=7,I=8,
J=9,K=10,L=11,M=12,N=13,O=14,P=15,Q=16,R=17,
S=18,T=19,U=20,V=21,W=22,X=23,Y=24,Z=25 )
and then applying the encryption function given, and then translating the numbers back into letters.

(a) f(p)=(p+5) mod 26 _____________

(b) f(p)=(p+12) mod 26 _______________

Encrypt message as : A=0,B=1,C=2,D=3,E=4,F=5,G=6,H=7,I=8,
J=9,K=10,L=11,M=12,N=13,O=14,P=15,Q=16,R=17,
S=18,T=19,U=20,V=21,W=22,X=23,Y=24,Z=25

and given encryption function :a) f(p)=(p+5)mod26 if p=Z=25

f(25)=(25+5)mod26

=30mod26=4

f(25)=E

and f(p)=(p+5)mod26 if p=15

f(15)=(15+5)mod26

=20mod26=20

f(15)=U

b) f(p)=(p+12)mod26

f(p)=(p+12)mod26 if p=Z=25

f(25)=(25+12)mod26

=37mod26=11

f(25)=L

and for f(p)=(p+12)mod26 if p=15

f(15)=(15+12)mod26

=27mod26=1

f(15)=B

c)f(p)=(p+4)mod26

f(p)=(p+4)mod26 if p=Z=25

f(25)=(25+4)mod26

=29mod26=3

f(25)=D

and for f(p)=(p+4)mod26 if p=15

f(15)=(15+4)mod26

=19mod26=19

f(15)=T

$Encrypt the message \$

Encrypt the message HALT by translating the letters into n

Solution

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