Questions tagged as 'criptografia'

Tagged questions
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How to create a system to generate hashes and be able to break without the original string?

Is there any way to break the Sha-256? Is there a mathematical process for getting a break? I need to create a program that generates several hashes and another one to break without having the original string (similar to Bitcoin), only using...
asked by 19.11.2015 / 13:24
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Java Cryptography with AES, how does it work?

I have already found several examples by Google, but none that explain how a java cryptography works with AES ... How does it work? In an example of the net, the guy cites that he has to use a key, but does not explain why or what it is for;...
asked by 06.05.2014 / 21:44
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How to allocate an immense amount of memory?

I created an OnFly encryption algorithm that encrypts bytes without having to copy them to a new copy of these same bytes. This is both for encrypting and decrypting these byte lists. As in the scheme below, the same string that enters will be t...
asked by 07.07.2017 / 20:53
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How to generate a hash on the client side?

I am researching ways to create a login system with a secure encryption that does not weigh to the server. Home Taking the example this answer I'm looking for a way to do client-side encryption, thus sending the password already encrypted for...
asked by 20.02.2015 / 16:52
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How does the meet-in-the-middle attack work?

I was looking for the old 3DES and I decided to search because there is no 2DES, I found little information, even because 2DES did not actually exist. Although it is also abbreviated as MITM, it has no relation to Man-in-the-middle , common...
asked by 31.07.2017 / 22:15
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Transform Byte into String

Problem: I am getting byte and when I try to transform to String it is giving error. ... byte[] msgBytes = ch.decode(hex, ch.key()); // retorna byte String msgDecode = msgBytes.toString(); // tentando converter byte em Stri...
asked by 27.02.2014 / 20:15
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App.config how to use 'ConnectionString' encrypted

In my app.config I have a section that for my String connection: </configSections> <connectionStrings> <add name="Azure.Onee" connectionString="Server=tcp:tps****.database.windows.net,1433;Data Source=tps****.databas...
asked by 12.09.2016 / 14:52
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Retrieve digital certificate information

I'm working with digitally signed PKCS # 7 PDF files. I have searched the internet and can not find a way to retrieve subscriber information. Using the SignedCms class I can even get some information when I do the decode of the...
asked by 06.05.2015 / 20:59
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POST and GET in SSL

On a site, secured with SSL, are POST and GET also encrypted? The fact that GET is part of the address, is it still encrypted?     
asked by 01.09.2014 / 04:51
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What is end-to-end encryption? How to apply it?

According to everything I researched and with the help of @bigown I came to the conclusion: "End-to-end encryption is done when only the connection's points have access to the key that will decrypt the content, that is, the data can UP or DOWN...
asked by 06.02.2015 / 23:07