# 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.

Kĩ năng: Mật mã, PHP, Programming, Lượng tử, UNIX

Về Bên Thuê:
( 21 nhận xét ) Szczecin, Poland

ID dự án: #15184615

## 21 freelancer đang chào giá trung bình \$15544 cho công việc này

albertmobi29

Greetings, We have experience with Cryptocurrency and similar kind of projects. We can assist you in writing codes for finding the whole sequence. Relevant Skills and Experience We are 80+ in-house professionals hav Thêm

\$15000 USD trong 10 ngày
(46 Nhận xét)
7.2
malviyamanish

Dear Client , We gone through project description We are Really intrested to do work with you , We are Web & Software development company having more than 8 year experience in Software development we totally commit Thêm

\$16666 USD trong 10 ngày
(172 Nhận xét)
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 trong 30 ngày
(65 Nhận xét)
6.7
utkarshkatiyar19

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

\$20000 USD trong 45 ngày
(174 Nhận xét)
6.6
maksimchukmak

Здравствуйте! Меня зовут Максим, из Киева, Украины (UTF + 2) Я буду краток. Мы являемся компанией IntoBi. Наши разработчики имеют огромный опыт разработки корпоративных решений на разных уровнях. Stay tuned, I'm sti Thêm

\$20000 USD trong 30 ngày
(23 Nhận xét)
5.9
\$16666 USD trong 10 ngày
(17 Nhận xét)
6.0
Designbackoffice

Hi Team, This is Jay Brown from Design Back Office Located in California, USA. I have gone through the description & interested in you project. Please do checkout our portfolio at: https://www.freelancer.com/u/D Thêm

\$15000 USD trong 40 ngày
(23 Nhận xét)
5.9
BigCityInstitute

I have already written sha256 with opencl and developed it on the GPU. It was also used for bitcoin mining and was used to produce bitcoin wallets. If you want, I can show it to you. Relevant Skills and Experience Thêm

\$15000 USD trong 2 ngày
(16 Nhận xét)
6.3
alwaysanshuman

Hi, this is Anshuman from Atventus India. We have been into Web Development and Design since past 8 years. We have been creating awesome websites for myself and various clients around the world. We focus on great user Thêm

\$10000 USD trong 10 ngày
(23 Nhận xét)
5.5
Prograam

I’m Ananya from dotlogic Technologies. I saw your project and found myself suitable for the job. I think i can perform the given tasks in the specific timeframe. Looking forward to work with you. Relevant Skills and Thêm

\$13333 USD trong 8 ngày
(7 Nhận xét)
4.2
sarathginjupalli

Hi, I can do this project, I can find the remaining hashes in constant storage space. I broken the sha1 using "Pollard's rho method". Given the computing resources you have I can break sha256. Relevant Skills and E Thêm

\$15000 USD trong 15 ngày
(6 Nhận xét)
3.9
ambyt

I can do this job. I have got 9 years of development experience so I will be able to do this job efficiently. Relevant Skills and Experience PHP, WordPress, Joomla, Magento, Cake php, CodeIgniter,Prestashop, Shopify, Thêm

\$16666 USD trong 25 ngày
(5 Nhận xét)
3.9
zkutch

Hello More 20 years programming experience. I need more details to set real price and time. Regards. Relevant Skills and Experience More 20 years programming experience. Proposed Milestones \$11111 USD - solution I n Thêm

\$11111 USD trong 10 ngày
(12 Nhận xét)
3.9
beckondelveinfo

Hello There, Greetings ! I have studied your details & will be glad to assist you. MY EXPERIENCE -------- I'm a full stack Sr. WEB DEVELOPER having 6+ years of experience in Wordpress Development & worked Thêm

\$14444 USD trong 7 ngày
(5 Nhận xét)
3.3
BeautiCG

hi,dear. We understand your requirements and I am very interested in this job - 'Calculate / find SHA256 hash sequence (GPU, Quantum Computing)'. We are senior software developers and I am able to perform this task wit Thêm

\$16666 USD trong 100 ngày
(12 Nhận xét)
4.1
shriramvijay

Greetings, I WILL DO THIS WORK AS PER YOUR REQUIREMENT AND EXPECTATIONS. With the experience of over 600+ web development projects including ANDROID , iOS , WEBSITES , WEB APPLICATIONS AND SOFTWARES . To check ou Thêm

\$10055 USD trong 10 ngày
(3 Nhận xét)
2.6
freelancerkpis

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1.9
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1.5
mobileappsites

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1.2
Dreamzcommu

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\$15000 USD trong 50 ngày
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0.0