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Ethereum Wiki:

Every unique set of key/value pairs maps uniquely to a root hash, and it is not possible to spoof membership of a key/value pair in a trie (unless an attacker has ~2^128 computing power)

I did not understand the statement shown above, where:

[Q] Why an attacker needs ~2^128 computing power to spoof membership of a key/value pair in a trie?

Thank you for your valuable time and help.

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