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Cryptography
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NH.
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Cryptocurrency serving as hash breaking?
Note that the one possibility this answer doesn't address is that of attaching extra scripts to the transactions (in this scenario the blockchain could be normal, but the extra scripts could do the cracking work), as was done in the Bitcoin wild, and elaborated on by a bitcoin.SE answer.
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 Editor
revised
What are preimage resistance and collision resistance, and how can the lack thereof be exploited?
two-way function, not two-function function
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What are preimage resistance and collision resistance, and how can the lack thereof be exploited?
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 Student
comment
Property that prevents determining key from ciphertext and plaintext
you have $2^{123}$
comment
Property that prevents determining key from ciphertext and plaintext
I think you meant $2^{128}$?
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 Scholar
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Property that prevents determining key from ciphertext and plaintext
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 Supporter
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 Autobiographer
asked
Property that prevents determining key from ciphertext and plaintext