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Laie committed Jun 28, 2017
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Sha256 vulnerability for full rounds. Free-start collision attack + circular hash attack(new type of hash attack).

# Proof
run proof.py to check
Run proof.py to check my work

# Concepts
## Free-start collision attack
a collision attack which hackers cannot control the input hash.
A collision attack where 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.
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. So, this attack makes one hash value permanently vulnerable to collisions. So, I decided not to publish another works.
# 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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