1. Key is 256 bits K
2. Half of K is a random 256 bit X
3. Other half is (K xor X), still 256 bit
Having half of key is still 256 bit bruteforcing.
2. Half of K is a random 256 bit X
3. Other half is (K xor X), still 256 bit
Having half of key is still 256 bit bruteforcing.
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