How to encrypt the pdf file using c#.net?

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Dear all,
I am using visual studio 2010 and work in windows application. i need to encrypt the existing pdf files any one give me the reference for do it.

Thanks advance.

Regards,
Karthik M

What I have tried:

I am tried to encrypt the existing pdf file.

Posted 27-May-16 1:19am

Member 11889799

Updated 27-May-16 2:18am

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F-ES Sitecore 27-May-16 7:41am

Google "encrypt file c#" and you'll find lots of examples.

Jewel-Davis 23-Jun-16 5:56am

I'm not sure if the suggested answers work for you or are you looking for something else. The PDF files itself have a support for encryption, see this article about PDF Encryption done in .NET (the article uses this .NET library for word and pdf files).

2 solutions

Solution 1

Microsoft itself gently provides sample code: Encrypting Data[^].

Posted 27-May-16 1:48am

CPallini

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W∴ Balboos, *GHB* · Accepted Answer · 2016-05-27T02:18:00

If you wish to do a custom encryption of a file (any file), you need to do the following:

1) Open the file in binary mode
2) Read data (character or block, as appropriate for your algorithm)
3) Apply you custom encryption algorithm to data
4) Write to 'new' file.
5) Repeat 3, 4, 5 until entire file is processed
6) Close source and target files.

Now - there are many improvements that can be made, such as keeping the entire original file in memory, encrypting, and then overwriting the source, but that depends upon what you want to do. There are also pre-written algorithm, such as DES, to do much of the work for you.