# Calculate / find SHA256 hash sequence (GPU, Quantum Computing)

I'm looking for someone who can help me come up with the best possible solution for a project my company is doing for one of our university clients. Geeks and creative minds are most welcome!

Imagine there is a sequence of 2 million SHA256 hashes and each hash on the list is generated based on the previous one, so for example hash number 1 is:

\$hash1 = 4a86d363c0f674e05378faecbcb94799db30e5d5a2fa780f8776eb46aa2b2db

and hash number 2 will be (using PHP function here):

\$hash2 = hash('sha256', \$hash1);

Now the interesting part. Only the two last of these hashes from the list are known (so hash number 1,999,999 and hash number 2 million), and we need to somehow find (calculate, crack, brute-force, etc.) the first hash in the whole sequence, thus revealing the complete sequence.

In other words, all hashes are "hidden", and only the two last ones are known.

I have come up with a PHP script, but the time needed to execute it exceeds the age of our universe (literally), so another approach is necessary.

I think this is similar to mining cryptocurrencies (solving hashes), so i believe we could use GPUs to speed things up. I can have access to a professional mining rig (6 x RX580, i think above 100 MHash computing power), but i don't know how to write the software (what language would be best here?).

Another idea was to use quantum computing, but again i don't know how to write the script. I know that IBM is offering access to quantum computing: [url removed, login to view]

Or perhaps totally different idea would help here...?

Also, my PHP solution is "linear", so it can only be run in a single instance, it's not possible to distribute it or run in paralell (due to the fact of having to store all hashes in a database, which would be HUGE). Is there a way to change the architecture, so it can run on multiple machines?

I'm open to any ideas that can help here! :)

Please wirte a few words about you and how would you approach solving this task. I'd like to make sure that you are a real human person interested in completing the project :) Thanks!

This is a project i'm posting on behalf of my company, we are offering 15.000 USD to a person that can help us solve this puzzle successfully. Long term emplyment opportunity is very possible afterwards.

Skills: Cryptography, PHP, Programming, Quantum, UNIX

( 21 reviews ) Szczecin, Poland

Project ID: #15184615

## 21 freelancers are bidding on average \$15544 for this job

albertmobi29

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\$15000 USD in 10 days
(46 Reviews)
7.2
malviyamanish

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\$16666 USD in 10 days
(172 Reviews)
7.3
hawkscodeaus

I have 7+ years in PHP - website design & development with very good experience. Relevant Skills and Experience I am good in Cryptography, PHP, Programming, Quantum, UNIX Proposed Milestones \$13600 USD - Cost

\$13600 USD in 30 days
(65 Reviews)
6.7
utkarshkatiyar19

hello sir, I have experience with quantum computing. I can do this for you.

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(174 Reviews)
6.6
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5.9
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6.0
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5.9
BigCityInstitute

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6.3
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Prograam

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4.2
sarathginjupalli

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4.1
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