[quote author=lyka https://bitcointalk.org/index.php?topic=455591.msg11029682#msg11029682]
i have a password more than 100 characters
by mistake it was printed not all
but the wallet was opened
Is it possible at least theoretically?
it shouldnt be possible… wallets are encrypted with the password so if its even one char wrong, it wont work. unless they printed the password, and THEN created the wallet using the (shortened) password in which case it would work as they would be opening the wallet with the same password that was used to encrypt it.
Or it is practically impossible because the probability is very small (for example p≈10^-77)?
What is the probability that two passwords give access to one wallet?
Not a very technical answer but I think I've come across this, where the password was limited to say 50 characters (I forget in my case exactly where the limit was) but this was an unstated rule, so I had chosen a mega-long passphrase.
Each time I entered it, it would stop/be cut off at the same point, and therefore succeed.
It took a while of typing the whole thing in to figure out where the limit lay.
I should point out this wasn't wallets etc, but maybe there is something similar at play.
Funny no one has noticed that before ^^
Current max password size is 128 - that's an artificial limit, we could change it in future.
(to clarify wallet when it's being created, takes only first 128 bytes inco consideration, that's why it works when opening it).
Woohoo what do I win? 
haha