It is when a environment is set so that passwords can potentially be viewed by administrators... theoretically so that users can have passwords retrieved, etc. However, this effectively means that the password is stored in plain text somewhere.
CHAP is one authentication protocol that needs reversible encryption enabled.
reversible
Yes, this change is reversible.
Encryption
This is a reversible process.
You think probable to a reversible reaction.
reversible
no soil is not reversible.
reversible!
A Bunsen burner is an object: it is not a process of any kind.
Reversible.
reversible
reversible