> Assuming it's a base64-encoded integer, it would be a 14-byte integer. I think that would make a collision a fairly rare occurrence. I agree, I think the fac

> Assuming it's a base64-encoded integer, it would be a 14-byte integer. I think that would make a collision a fairly rare occurrence. I agree, I think the fact that these people are coworkers and both were using the network here is relevant, but I don't know enough about networks or google's account system to make good guesses as to what happened. There would be something like 2^(14*8), or 5 million billion billion billion unique session ids. A collision occurring in the first place must be rare, for it to be two people who are coworkers must be some orders of magnitude more rare.