It should be easy. I assume that you know which fields Authlogic requires. One of them is password_salt. Make sure to use the Devise salt in the password_salt field.
At the top of the user model, add the following:
acts_as_authentic do |config|
config.crypto_provider = Authlogic::CryptoProviders::BCrypt
end
Also, I assume that you already have a BCrypt gem in your gemfile.
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