How to Decrypt the contents of the File.

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Hello Everyone..

Am using Encrypting the text like this in WIN32:

C#

char textOut[25]="This text is for Encryption";
for(int q=0;q<=len;q++)
                    {
                        textOut[q]=textOut[q]^0xAA;
                    }
MessageBox(NULL,textOut,"",MB_OK);

Anyhow, Am getting Encrypted text in MessageBox.. But Am not getting how to Decrypt back..

Please help me.. And is there any better way to Encrypt & Decrypt.. If So do tell me..

Thanks in Advance..!

Posted 2-Apr-12 1:43am

Guru_C++

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Comments

Sergey Chepurin 2-Apr-12 7:52am

If even a creator of encryption does not know how to decrypt it, leave it unbreakable for crackers to get defeated.

Guru_C++ 2-Apr-12 7:59am

Actually, In my Tool_a.exe Application, I have to Encrypt the Contents of the File.. And in Tool_b.exe application, I have to Decrypt the Contents of the file & it is viewed by only autheticated users.. So Am trying to Decrypt it..

Jochen Arndt 2-Apr-12 8:03am

So you are using an encryption method without knowing what you are doing?

Sergey Chepurin 2-Apr-12 8:32am

If you want to complete a single task without deep involvement, you can use CryptoAPI samples from Microsoft, for example:http://msdn.microsoft.com/en-us/library/aa382016(v=vs.85).aspx
But if you want to create something, read introductory materials available. For example, free chapters from "Handbook of Applied cryptography": http://msdn.microsoft.com/en-us/library/aa382016(v=vs.85).aspx

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CPallini · Accepted Answer · 2012-04-02T01:58:00

Solution 1

Performing the XOR operation again would give you back the original character, try:

C++

char plain = 'A';
char encrypted = plain ^ 0xAA;
char decrypted = encrypted ^ 0xAA;
assert(plain==decrypted);

Posted 2-Apr-12 1:58am

CPallini

Comments

Resmi Anna 2-Apr-12 8:17am

A 5!

CPallini 2-Apr-12 8:19am

Thank you.

Guru_C++ 2-Apr-12 8:40am

Thank you.. It is working..

CPallini 2-Apr-12 8:45am

You doubted about, didn't you? :-D
You are welcome.