Re: a challenge (no solution yet)
On Thu, Oct 18, 2001 at 01:58:10PM +0200, martin f krafft wrote:
| goal: a 4-16 byte 7-bit character value that somehow encodes the time
| of creation such that it can be extracted if the encoding scheme/seed
| is known. the encoded value should be such that it is mostly
| impossible to change it so as to yield a later time of creation to be
| encoded. in general, changing the encoded value may well render the
| data invalid.
| this is supposed to be a token that's valid for a limited amount of
| time, after which, a new token has to be fetched. this token should
| not be obvious (e.g. the timestamp) to prevent people from changing
| it to be valid longer rather than fetching a new one.
| can you do it? or is there a tool out there?
I honestly don't know, but maybe Kerberos is what you are looking for?
(I know nothing except little bits I've caught in passing about
- a challenge
- From: martin f krafft <email@example.com>