Fast, simple to use symmetric cipher for integer encryption in Java

Question

What is in Java a cipher function for integer encryption having these properties?:

• Fast
• Symmetric-key algorithm
• Simple to use (i.e. a couple of

Answer 1

If you don't need a secure solution, but just fast one, consider the XOR cipher:

int key = ...
....
int b = a ^ key;
int c = b ^ key;
assert (c == a);