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RIPA does not AFAIRecall include requirement to surrender a key.
Providing a decrypted version is the requirement. Also problematic.
On 24/10/15 16:10, Martijn Grooten wrote:
> On Sat, Oct 24, 2015 at 03:44:26PM +0100, Tom wrote:
>> I think that's obfuscation rather than encryption: making them
>> unintelligible.
>
> No. Obfucation is a property of encryption, but obfuscation is used far
> more widely. Think of obfuscating a piece of _javascript_ code, by using
> random function and variable names, adding complicated functions that do
> nothing but concatenate two strings etc. It's pretty hard to decide what
> the code actually does, but it's still _javascript_.
>
>> I've often wondered how you could tell you've actually decrypted
>> something or just randomly generated what appears to be a valid
>> result.
>
> You cannot. A typical encryption scheme takes an input of n bytes and,
> using some kind of key, turns that in an output of n bytes. This means
> any one of 256^n possible inputs can be turned into any of 256^n
> possible outputs. If there were a way to distinguish these outputs from
> random, some outputs wouldn't occur and thus some outputs would have to
> occur twice, for different inputs. Which means you can't decrypt this
> output.
>
> If you could somehow deduce from the encrypted data that the
> corresponding plaintext was, say, an HTML file or an MP3, this would
> leak valuable information and make the encryption scheme useless.
>
> Martijn.
>
>
>
I figured that - yet people can go to jail for not handing over a key
when there cannot be proof a file is encrypted.
Tom te tom te tom
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