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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.
Once a hash is generated, we need to be able to store it to be compared for authentication purposes. The source code of the BCrypt Ruby Gem actually offers great insight into how this is performed in Rails:
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