[Rails] password encryption is not working..

I am using require 'digest/sha1' to encrypt my password and save into
database. During login it is showing the following error-

undefined local variable or method `encrypted_password' for
#<Signin:0x992c990

code:

before_save :encrypt_password

def has_password?(submitted_password)
encrypted_password == encrypt(submitted_password)
end

private

def encrypt_password
self.salt = make_salt unless has_password?(password)
self.encrypted_password = encrypt(password)
end

def encrypt(string)
secure_hash("#{salt}--#{string}")
end

def make_salt
secure_hash("#{Time.now.utc}--#{password}")
end

def secure_hash(string)
Digest::SHA2.hexdigest(string)
end

Please help me dis !

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