A valid digital signature gives a recipient reason to believe that the message was created by a known sender (authentication), that the sender cannot deny having sent the message (non-repudiation), and that the message was not altered in transit (integrity).
Load index is an assigned number that corresponds with the load-carrying capacity of a tire. Most passenger car tire load indexes range from 75 to 100, but a few carry more. You'll also find the maximum load elsewhere on the tire sidewall, both in lbs and kg.
In most cases, the load index number is included near the end of an alphanumeric format on the tire's sidewall. This format also contains the tire's width, sidewall height, size in diameter and maximum speed rating: 225/50SR16 89S. 225/50R16 89S.