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Results tagged with sha-256
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user 75391
SHA-256 is part of the SHA-2 family of hash functions with a 256-bit output and a 128-bit security level.
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Does double hashing increase resistant against first preimage attacks?
Let's take Bitcoin as an example. Bitcoin uses SHA256, which can be vulnerable to collision and preimage attacks - although this is extremely unlikely to happen in the near-future.
However, let's sa …
- 153
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If I concatenate two colliding SHA-256 messages with the same prefix and suffix, will the re...
So let's say that there are two messages, $x_1$ and $x_2$, which hash to the same output. In other words, these two messages collide with each other:
$$\operatorname{SHA256}(x_1)=\operatorname{SHA256 …
- 153
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Does fixing partial bits of a SHA256 hash increase the probability of finding a preimage usi...
Let’s say I want to find a partial rather than full preimage using the meet-in-the-middle attack. For example, my goal is to find a preimage so that the first 76-bit output of the hash are all consist …
- 153
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If I allow arbitrary initial hash values for SHA-256, what would be the weaknesses?
The initial hash values (IV) of SHA256 are fixed. However, let's say I modify the SHA256 hash function to allow the attacker to use arbitrary IVs rather than fixed IVs. What kind of weaknesses would t …
- 153