Re: [android-developers] help for encryption of sd card storage?

[Xun Sun]

Hi,

On Mon, Apr 11, 2011 at 2:47 PM, Hitendrasinh Gohil
 wrote:
> hi,
>
> I am downloading file from server and write this file to  sd card.now
> i want to encrypt this file so that only my application can access
> this file.
>
> i) if i can encrypt the file path only that can be access on
> decrypting it?

Are you looking into encrypting individual files? org.bouncycastle.*
have the crypto functions that you can use to encrypt a file.

You might also want to check this policy:

http://developer.android.com/reference/android/app/admin/DeviceAdminInfo.html#USES_ENCRYPTED_STORAGE
>
> which is the best encryption algorithem i can use for?

There are symmetric ones and asymmetric ones. You are likely more
interested in symmetric encryption, where the keys used for encryption
and decryption are the same. DES and ASE are the most popular ones.

>
>
> thankx
>
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Thanks & regards
Xun Sun

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Re: [android-developers] help for encryption of sd card storage?

[Marcin Orlowski]

On 11 April 2011 08:47, Hitendrasinh Gohil wrote:


> i) if i can encrypt the file path only that can be access on
> decrypting it?
>

This is file path: "/sdcard/my-file.foo". This is just string. If you
encrypt it will look i.e. like "ne87hfi8xs4rkdjxbkvcv". How this is expected
to make *content* of your file safer?


> which is the best encryption algorithem i can use for?
>

There's no "best encryption algorithm". Choose that one that suits your
needs bests, considering complexity, strength, type and computing power
needed to encrypt your dataset in the acceptable time.


Regards,
Marcin Orlowski

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[android-developers] help for encryption of sd card storage?

[Hitendrasinh Gohil]

hi,

I am downloading file from server and write this file to  sd card.now
i want to encrypt this file so that only my application can access
this file.

i) if i can encrypt the file path only that can be access on
decrypting it?

which is the best encryption algorithem i can use for?


thankx

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