require 'openssl'
require 'base64'
require 'digest/sha1'
c = OpenSSL::Cipher::Cipher.new("aes-128-cbc")
c.encrypt
# your pass is what is used to encrypt/decrypt
c.key = key = Digest::SHA1.hexdigest("whatever")
# c.iv = iv = c.random_iv
e = c.update("190")
e << c.final

puts "encrypted: #{Base64.encode64(e)}\n"
c = OpenSSL::Cipher::Cipher.new("aes-128-cbc")
c.decrypt
c.key = key
# c.iv = iv
d = c.update(e)
d << c.final
puts "decrypted: #{d}\n"