Cryptography, Algorithms, Software Engineering, Math, Technology.
around, from B to A, should be non-trivial. A silly example would be multiplication. If we let A = 6, then multiply 6 x 3, we get B = 18. To get A back again, we use the inverse operation of multiplication-that is division. So we just divide B by 3 (18 / 3 = 6) to get A back. This may be an