New answers tagged preimage-resistance
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Your idea of salting the signature to prevent the collision attack doesn't work, because your salted signing operation is a deterministic mathematical function, and the random choice of salt is only made at signature time, not at verification. Your signature algorithm has to be something like this. For a document $x$ and hash function $H$:
Hash the document:...
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Let's begin with what is MD5;
MD5 has a 128-bit digest size, 512-bit block size Merkle–Damgård construction based hash function created by Ronald Rivest in 1992.
From a secure hash function we want, 128-bit pre-image and secondary pre-image resistance, and 64-bit collision resistance. MD5 collision resistance is broken, and finding collision can be done in ...
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preimage-resistance × 143hash × 112
collision-resistance × 52
2nd-preimage-resistance × 31
sha-256 × 18
md5 × 12
sha-1 × 7
cryptanalysis × 6
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brute-force-attack × 5
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sha-3 × 5
sha-2 × 5
hmac × 4
attack × 4
signature × 3
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aes × 2
block-cipher × 2
algorithm-design × 2
mac × 2
terminology × 2
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