On Wed, Feb 16, 2011 at 11:30 PM, Joep Suijs <[email protected]> wrote:
> Hi Guys, > > I am afraids these postings get too long for me te keep up :( > > Please consider: > > - Determine the quality of a pseudo random sequence is mathematics. > I've choosen a pretty good algorithm (according to the info I found on > the net) and would suggest to use it or switch to a weaker on if you > need to save time or flash space. Or of course a better algorithm, but > i've not seen any valid arguments for this. > - It would be good to have - in addition to the algorithm at hand - a > way to generate a seed that is non-deterministic, even when this is > low-quality like using unconnected adc registers or memory value. This > generator should works on any pic (or at least most pics) and is > independent of external components. > - The suggested methodes could give such a seed, but will provide much > less quality (pseudo) random than the algorithm at hand. So please > don't consider it a replacement. > - Real random (opposed to pseudo random) requires some external source > like atmospheric noise (see http://www.random.org/). The avalanche > effect of a semiconductur might be a local alternative > ( > http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1338337/pdf/jeabehav00162-0045.pdf > ) > I like this stuff from 57! Nothing has changed. Here is used the same principle: http://www.sentex.ca/~mec1995/tutorial/xtor/xtor6/xtor6.html Vasile P.S: what is so important that need a real random generator? -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
