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In the case of a compromise or suspected compromise of a key which of the following are true
All variants and non reversible transformations of that key must be replaced.
All keys encrypted under or derived using that key must be replaced.
All of the above are true
The replacement key must NOT be a variant of the original key. Other answers are true
Do you mean that the other answers are false. Only "All keys encrypted under or derived using that key must be replaced" is true.
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