csail/6006psets_ng — comment on commit 837c03ca86177f4d55790c7444d0b32e98b2b026
File: 5/code/rsa/big_num.rb line 5
By pwnall:

I searched for `.d =` and couldn't find any instance. Can you make this an `attr_reader`?

You should make it protected while you're at it, too `protected :d`.