From where can I download BlowFish.BlowfishNET.dll?

How can I find this dll file? I need it for my graduate project.

I'm working on encrypting/decrypting tool for a streams/file(s)开发者_运维知识库, any guidance?

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First hit on Google.

The download includes both a demo app and a test project, which should help you with part 2 of your questions. If you have a specific problem with encryption and decryption, you should ask a specific question.