From: Swair Mehta <swairme...@gmail.com>
>To: "fr...@baggins.org" <fr...@baggins.org>
>Cc: "openssl-users@openssl.org" <openssl-users@openssl.org>
>Sent: Saturday, August 17, 2013 7:18 AM
>Subject: Re: How to securely encrypt identical files to identical ciphertext?
>
>
>On 16-Aug-2013, at 9:24 AM, Matt Caswell <fr...@baggins.org> wrote:
>
>> On 16 August 2013 16:46, Swair Mehta <swairme...@gmail.com> wrote:
>>> On 16-Aug-2013, at 7:49 AM, Unga <unga...@yahoo.com> wrote:
>>>
>>>> Hi all
>>>>
>>>> I have a requirement to encrypt files, in such a way identical files
>>>> should generate identical ciphertexts.
>>>>
>>>> I plan to use aes-256-cbc cipher with 128-byte long non-guessable password
>>>> per input file. Identical input files will be provided with identical
>>>> passwords.
>>>>
>>>> 1. Is it no salt the way forward for me?
>>> Identical salts(ivs) should work. No salt works as well.
>>
>> This would have the effect that two files which were identical at the
>> beginning for the first x number of blocks (but different afterwards)
>> would encrypt to the same first x number of blocks.
>
>What was the original question??
>
Hi Swair
I'm using very long non-guessable per file unique passwords. If by some luck
find a password, it can only be used to decrypt one file, not any
other file. So my question is, if I use no salt, does it become any less secure
than with salt?
Unga
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