[Cialug] Complete C source online

[kristau]

What you should do to *really* confuse the NSA is only encrypt random data.
. .


On Wed, Jul 24, 2013 at 7:11 PM, Morris Dovey <mrdovey at iedu.com> wrote:

> On 7/24/13 3:33 PM, Jeffrey Ollie wrote:
>
>> What's the encryption algorithm used here?  Based on the lack of
>> comments in the code am I right that this is an algorithm that you've
>> invented yourself?
>>
>
> The sample program can perform three operations on an entire file:
> [1] It can move every byte to another (randomly selected) byte position;
> [2] It can move every bit to another (randomly selected) bit position;
> [3] It can (randomly) complement/not complement each and every bit.
>
> Each of the operations is prefaced by seeding the PRNG with a portion of
> the key, and then the operation to be performed is selected randomly.
>
> This process is repeated until the entire key has been used up. The actual
> code that does this is the line:
>
> for (i=0; i<KEYS; i++) op[key[(h + i) % KEYS] % nops](key[i],b,n);
>
> where KEYS is the number of elements in key[];
>       key[] is the array that contains the key;
>       nops  is the number of elements in op[];
>       op[]  is an array of function pointers;
>       b     is a pointer to the file data;
>       n     is the length of the file;
>       h     is one half the number of key elements;
>       i     is the loop index
>
> It’s hard to think of this as an “invention” - it’s more like a
> straight-forward way to FUBAR a file so thoroughly that without the
> original key, there’s no feasible way to backtrack to the original data.
>
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-- 
Tired programmer
Coding late into the night
The core dump follows