[akerro]

The string is longer so collision is harder to find. btw that's a way .onion addresses are generated, it takes first 80 bytes from the key and outputs base32 from the input.

[CiPHPerCoder]

Rather, it takes the first 80 bits of a SHA1 hash of a 1024-bit RSA public key, then converts it to base32.

Obviously, collisions aren't obscenely expensive.