How to encrypt data in file during file creation in c# .net?

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Hello,

I want to encrypt data of file using c#,I am using this code my file it's not encrypting.
My code:-
FileStream fs1 = new FileStream("D:\\Licence.DAT", FileMode.OpenOrCreate, FileAccess.Write);
File.SetAttributes("D:\\Licence.DAT", FileAttributes.Encrypted);
StreamWriter writer = new StreamWriter(fs1);
writer.Write("Validated Days:" + "" + txtValidatedDays.Text);
writer.WriteLine("\n" + "MAC Address:" + "" + txtMacAddress.Text);
writer.Close();

MessageBox.Show("Licence Generated Successfully");

Please help me.

Thanks in Advance.

Ankit Agarwal
Software Engineer

Posted 4-Apr-14 1:59am

ankit.agg1984

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OriginalGriff · Answer 1 · 2014-04-04T02:07:00

Solution 1

Don't encrypt it: you need to provide a key to decrypt it each time foe comparison.
Instead, use a hashing function and compare the outputs instead.
MSDN: SHA512[^]

And you are aware of just how easy it is to "spoof" a MAC address[^], aren't you?

Posted 4-Apr-14 2:07am

OriginalGriff

Comments

Rob Philpott 4-Apr-14 10:42am

I'm missing something here. How do you know he wants to check the integrity (compare hashes) rather than actually encrypt the data?

OriginalGriff 4-Apr-14 10:47am

MessageBox.Show("Licence Generated Successfully");
Implies it's a license key he's generating.