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What Math has told you is correct if you assume uniqueness and equality. For example, from a = b + c, it follows that b = a - c. Why is that? Addition has an inverse function mapping a pair of integers to a unique integer again. If you think of + as a function with infix notation and two arguments. Think of - as the inverse of that function. Then you would ...


Jasypt's StrongPasswordEncryptor is a special case of Jasypt's StandardStringDigester that, despite its name, is not standard at all. From the description, it appears to be some custom construction, which thus has the same problem than any other non-standard construction: it has not been reviewed. We don't know how to design secure functions, and the best we ...

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