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bcrypt-ruby
bcrypt-ruby is a Ruby binding for the OpenBSD bcrypt() password hashing algorithm, allowing you to easily store a secure hash of your users' passwords.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
BCrypt is a hefty gemfile that uses hashes and salts to encrypt passwords in your database. Hashes are a fixed-length value that will always produce the same output for the same given input. The output can be a 32-bit or 64-bit number. What BCrypt does, is add a salt to this hash, which is an additional 29-bit number that generates a new salt every time you login with your password. This method makes it incredibly difficult to hack into the database to reveal the actual password to a user.