File-Encryption/Work.txt at master · wolvespaw/File-Encryption · GitHub

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Given:
	10101010 //original input
	10011001 //key1
	00010001 //key2
	11001100 //key3
Equation:
	(Input XOR key1) AND (key2 OR key3)
Output:
	(10101010 XOR 10011001) AND (00010001 OR 11001100)
	00110011 AND (00010001 OR 11001100)
	00110011 AND 11011101
	00010001
Reverse:
	00010001=(Input XOR key1) AND (key2 OR y)		//key3 is hidden by assigning it the value of key1 after finishing the equation
	00010001=(Input XOR 10011001) AND (00010001 OR y)	//(i.e. key3==key1)
	00010001=(10101010 XOR 10011001) AND (00010001 OR y)	//input never changed by program
	00010001=(00110011) AND (00010001 OR y)			//simplified
	----
	00010001=00110011 AND x					//simpified to x
	----------------------------------------------------------------------------------------------
	00010001=(x XOR 10011001) AND (key2 OR key3)
	00010001=(x XOR 10011001) AND (key4)			//key4 defined as key2 OR key3
	(x XOR 10011001) = special(key4, 00010001)		//special removes AND, see Bit.java
------------------------------------------------------------------------------------------------------
key hiding in FileTest001
	encrypt:
		rotate key2 to the right(no carry), write to output
		key1 = AND (XOR(key1, key2), key3), write to output
		rotate key3 to the right(no carry), key3 = XOR(key2, key3),
		rotate key3 to the right(no carry), write key3 to output
	decrypt:
		key2 = bitValue(input.nextLong());
		key2.rotateLeftNoCarry();		//finished key2
		key1 = bitValue(input.nextLong());
		key3 = bitValue(input.nextLong());
		key3.rotateLeftNoCarry();
		key3 = XOR(key2,key3);
		rotateLeftNoCarry(key3);		//finished key3
		key1 = special(XOR(key1,key2),key3);		//finished key1