1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//Decryption
// Move scilab to current file directory
[u,t,n] = file()
n = strcat(n)
file_name = basename(n)+fileext(n)
file_name = strcat(file_name)
ind=strindex(n,file_name)
path = part(n,1:ind-1)
chdir(path)
exec("Chapter_2.sci",-1)
pt = "Ifmmp Kpio"
disp("Plain-text message:")
disp(pt)
a = ascii('a')
z = ascii('z')
A = ascii('A')
Z = ascii('Z')
ct = []
for i=1:length(pt)
x = ascii(part(pt(1,1),i:i))
if x>=A & x<=Z then
//function from dependency file
ct(1,i) = decrypt_caesar_general(part(pt,i:i),1)
elseif x>=a & x<=z then
c = convstr(part(pt,i:i),'u')
c = decrypt_caesar_general(c,1)
c = convstr(c,'l')
ct(1,i) = c
else
ct(1,i) = part(pt,i:i)
end
end
ct = strcat(ct)
disp("")
disp("Cipher text")
disp(ct)
|
