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diff --git a/3544/CH2/EX2.43/Ex2_43.sce b/3544/CH2/EX2.43/Ex2_43.sce
new file mode 100644
index 000000000..40dc463c1
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+++ b/3544/CH2/EX2.43/Ex2_43.sce
@@ -0,0 +1,45 @@
+
+//Encryption
+
+// 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 = "Hello John"
+
+disp("Plain-text message:")
+disp(pt)
+
+a = ascii('a')
+z = ascii('z')
+A = ascii('A')
+Z = ascii('Z')
+
+
+ct = []
+for i=1:length(pt(k))
+    x = ascii(part(pt(k,1),i:i))
+    if x>=A & x<=Z then
+        //function from dependency file
+        ct(k,i) = encrypt_caesar_general(part(pt(k),i:i),1)
+    elseif x>=a & x<=z then
+        c = convstr(part(pt(k),i:i),'u')
+        c = encrypt_caesar_general(c,1)
+        c = convstr(c,'l')
+        ct(k,i) = c
+    else
+        ct(k,i) = part(pt(k),i:i)
+    end
+end
+
+ct = strcat(ct)
+disp("")
+disp("Cipher text")
+disp(ct)