Before the use of of envelopes, what method was used to secure letters?

wax seal?

I would have said wax seal too. "Cyptography" is misspelled!

moose, read the explanation, it clearly states what it is

Wax seal. Seriously who would ever do anything else if you weren't a spy? FYI ; 99.99990 percent of people don't spy for anyone.

littleginny, It’s a code