Secret Password Encryption

Abstract

What I am calling secret password encryption (password encryption) is also known as shared secret passphrase encryption and password-based encryption (PBE). Basically, the idea is that a single passphrase (or password—I will be using those words interchangeably) is known by two parties, and they each encrypt messages or data to pass to each other using that password. The same password is used by the recipient to decrypt the messages and data. No one else can decrypt the data because the password is a secret, shared only by the two parties.