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A TrueCrypt Keyfile generator generates a keyfile of size 64 bytes. Can I change the size to become like 100 bytes by adding some more random data to it? Also, Is it good idea to store it on Online HDD on some server for backup?

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I wouldn't recommend saving it just on a server for backup. If something happens to the key while you don't have access to the server then you have no way to decrypt your files. Personally I save the key on a USB thumb drive so it is always readily available.

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Ideally you go and lock it in a safe and leave information in will with combination/key..., well you get the picture. – ewanm89 Apr 25 '12 at 16:46
@ewanm89: Do you mean a physical safe to lock USB drive? – user103251 Apr 25 '12 at 17:02
Well, I would choose CD, but yeah, somewhere safe to hide a backup. – ewanm89 Apr 25 '12 at 17:10
How safe you need to be depends on your own purposes. – ewanm89 Apr 25 '12 at 17:10
Is it not safe to put it in your mail account for example? – user103251 Apr 25 '12 at 17:22

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