ComeAndGo
A password, a key or a code, sent as a link that opens once — and then it is gone.
Asked for before it opens. Send it a different way from the link, so that whoever finds one does not also have the other.
If nobody opens it, destroy it after
Encrypted in this browser before it is sent, under a key that lives only in the link. We never see what you wrote, and once it has been opened — or the time runs out — the key that could unwrap our copy is destroyed too.
Sent from this browser
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