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diff --git a/3544/CH2/EX2.54/Ex2_54.sce b/3544/CH2/EX2.54/Ex2_54.sce
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+++ b/3544/CH2/EX2.54/Ex2_54.sce
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+// Diffie-Hellman key exchange
+
+n = 11                  // Two prime numbers
+g = 7					//need not be kept secret 
+printf("n: %d\ng: %d\n",n,g)
+
+x = 3                   // Alice's secret random number
+A = modulo((g^x),n)     // Alice's message to Bob
+                        //A  =  2
+ 
+y = 6                   // Bob's secret random number
+B = modulo((g^y),n)     // Bob's message to Alice
+                        //B  =  4  
+
+printf("x: %d\ny: %d\nA: %d\nB: %d\n",x,y,A,B)
+ 
+K1 = modulo((B^x),n)    // Alice's key
+						//K1  =  9  
+ 
+K2 = modulo((A^y),n)    // Bob's key
+                        //K2  =  9  
+printf('Alice''s Key %d\n',K1)
+printf('Bob''s Key %d',K2)
+ // K1 = K2, thus both Alice and Bob have the same key