Newbie Question about file Encription.

Discussion in 'encryption problems' started by Victorb, Mar 7, 2014.

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  1. Victorb

    Victorb Registered Member

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    Hi all. I am new here and I am sorry if I am posting this question in the worng section. If so, could the moderator please move it to the appropiate section. Thanks.

    My question is this. Does the actual 3 letter extention of the encrypted file matter? What mean is this. Say someone emails me an encrypted document that was encrypted with one of the dozens of free file encryption softwares out there. Do I have to download that program and install it to open that file? Or can I just change the the extention to match my encryption software and open it? Or do you have to download and install each program for every different type of encryted file you get?

    Thanks
     
  2. Palancar

    Palancar Registered Member

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    There are two ways to accomplish what you need. Forgetting the "extension" (your word) and just examining how this would work in the real world. If a person sends an encrypted file that is assembled by a specific software then you would need that software to decrypt the file on the other end. PGP encrypts to keys so to decrypt you need a key and its password, etc...

    However many FREE products such as 7zip, old style PGP, etc.... offer the assembly of a self decrypting archive. The software itself bundles the encrypted file inside of an exe that will do the decryption for anyone with the correct password. The receiver does not need any software only the MUST HAVE password built into the encrypted file. So you can create a self decrypting archive (exe) and then bundle it into a zip file and send it as an email attachment to anyone. They only need the password.

    Simply changing the extension (again your word) will NOT change what is needed to access the file sent.
     
  3. Victorb

    Victorb Registered Member

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    Okay. So if someone sent me a file the was encrypted with Meo Encryption Software using the Blowfish encryption algorithm, I could not decrypt that file with say, Truecrypt? It just seems to me (and I am not an expert) that what is most important is the algorithm that the file was encrypted with and not the program that used that algorithm to encrypt the file. But like I said, I am not an expert, it was just along these lines that I was thinking when I asked the question.
     
  4. Palancar

    Palancar Registered Member

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    Nope you would have to use the needed software. Even the though the algo's are identical there are differences in implementation. The most common and widely used is AES. That algo is "deployed" differently even though its the same core.
     
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