but the places I last visited with that requirement didn't offer the chance to add my own question (and answer).
Doc, here, for the sites that don't allow adding a question, it's very common to use a pattern in the answers.
Almost all my friends, relatives, colleagues, neighbors have a vast info about me. What was my first dog's name, which school I attended....etc.
There are apps that you can find a lot of info about others (Facebook,....)
Here, it's very common to use a pattern for the answers of these type of questions. Even if others know the correct answer, they don't know the pattern.
For example if the question is "What was your first pet name?" and the answer is "Cooper", I will type "Croeop" (first,last,second,penult,...)
Some one may answer "Coeoper" (Every other letter)
Someone may mix it with his mobile number and from end to first. "R0e9p0o6o7c7"
The limit is your imagination to create pattern for encrypting.
The key is when you encrypt your answers:
1- Use the correct answer, even if everyone else knows the answer.
2- Use the same key everywhere.
Otherwise you'll mix the pattern and may lock yourself out.
I thought it's common everywhere, but reading these comments, gives me the impression everyone just types the answer normally.