Quote:
Originally Posted by arnezami
Question: Why are there 253 Device Keys for a Player? Why exactly that (strange) number?
Answer: The largest trees used are 22 nodes high. Because there is a Device Key at each branch from the top to the starting position of a Player it will have 22 Device Keys for that tree. He will also have 21 for the sub-tree its part of. And so forth. This means a Player has 22 + 21 + 20 + ... + ... + 3 + 2 + 1 = 253 Device Keys.
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Far good :-)
Note however that a player never gets the root Device Key (neither the root master tree key), because a root key can derive the rest of them.
So the largest tree is 23 nodes hight.