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?

-- 
martin;              (greetings from the heart of the sun.)
  \____ echo mailto: !#^."<*>"|tr "<*> mailto:"; [EMAIL PROTECTED]
  
echo '[dO%O+38%O+PO/d0<0]Fi22os0CC4BA64E418CE7l0xAP'|dc

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