| # Optimal bloom filter size and number of hashes | |
| # Tips: | |
| # 1. One byte per item in the input set gives about a 2% false positive rate. | |
| # 2. The optimal number of hash functions is ~0.7x the number of bits per item. | |
| # 3. The number of hashes dominates performance. | |
| # Expected number of items in the collection | |
| # n = (m * ln(2))/k; | |
| n = 300_000 |
#Simple Authentication with Bcrypt
This tutorial is for adding authentication to a vanilla Ruby on Rails app using Bcrypt and has_secure_password.
The steps below are based on Ryan Bates's approach from Railscast #250 Authentication from Scratch (revised).
You can see the final source code here: repo. I began with a stock rails app using rails new gif_vault
##Steps
| <!doctype html> | |
| <title>Site Maintenance</title> | |
| <style> | |
| body { text-align: center; padding: 150px; } | |
| h1 { font-size: 50px; } | |
| body { font: 20px Helvetica, sans-serif; color: #333; } | |
| article { display: block; text-align: left; width: 650px; margin: 0 auto; } | |
| a { color: #dc8100; text-decoration: none; } | |
| a:hover { color: #333; text-decoration: none; } | |
| </style> |