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Hi all,
I need to encrypt or "obfuscate" the source code in a dll file to prevent reverse engeneering to find the code. Now how can I do this and wicth one is better, encryption or obfuscate ?

regards.
Posted

Encryption refers to some method of modifying data so that it is meaningless and unreadable in it’s encrypted form. It also must be reasonably secure, that is it must not be easily decrypted without the proper key.

Anything less than that will be referred to as obfuscation. This is data that is rendered unusable by some means, but is not considered as a serious form of encryption.

Link for it:
MSDN:How to encrypt and decrypt a file by using Visual C#[^]
 
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Encryption is not sufficient, since the key needed to decrypt the encrypted dll/code needs to be part of the dll, otherwise how will the .Net runtime understand it.

The better way is to obfuscate which mangles the intent or meaning of the code via various strategies like symbol renaming, flow obfuscation, call hiding, etc. So even if the code can be viewed, it cannot be understood. Some obfuscators for .Net like Removed Commercial Link also support encryption (as an added security measure) in addition to obfuscation.
 
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