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Laie committed Jun 28, 2017
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Expand Up @@ -5,9 +5,11 @@ Sha256 vulnerability for full rounds. Free-start collision attack + circular has
run proof.py to check

# Concepts
Free-start collision attack: a collision attack which hackers cannot control the input hash.

Circular hash attack: finding input_hash and message_block which makes input_hash=output_hash. In certain cases, it can result infinite set of collisions by chaining arbitrary number of circular blocks.
# Details
## Free-start collision attack
a collision attack which hackers cannot control the input hash.
## Circular hash attack
finding input_hash and message_block which makes input_hash=output_hash.
In certain cases, it can result infinite set of collisions by chaining arbitrary number of circular blocks.
# Attack methods
I developed an entirely new type of cryptanalysis theory to achieve this.

It has a similar form comparing to differential analysis.

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