In the 2000 film “Memento” by Christopher Nolan, the protagonist suffers from short-term memory loss. Throughout the film he meets several so-called friends, but due to his condition he never really knows if they are trustworthy or if they are trying to steal something from him.
“This scenario got us thinking because it leads to an interesting cryptographic problem — can a user securely recover his/her secrets using one password from a set of servers which cannot be trusted or even if they are the wrong servers?,” comments Dr. Gregory Neven, a cryptographer at IBM Research.
He adds, “We were also motivated by helping users who lose all of their devices — they too should still be able to retrieve their secret information using one password.”
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