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I am confused on how to solve this question about one way hashing

ar flag

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I know that I have to use decryption, but I am confused about how it breaks one-way (preimage resistance)

cn flag
@kelalaka They are supposed to break one-wayness, not collision resistance. Hint: What happens if you simply decrypt with IV?
kelalaka avatar
in flag
@Maeher Oh, why did I miss this. Yes, the IV and the hash value is key. Thanks. The otherwise quite complicated to do as homework.
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