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by wyager
4108 days ago
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You're describing a second-preimage attack. You can not use a birthday attack to pull this off. The expected difficulty of pulling of a second-preimage attack on RIPEMD-160 is close to 2^159, which is more than sufficient. The reason SHA-1 is insecure is that it is cryptographically broken, and the same attack takes less than 2^60 attempts. |
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