Abstract: Authentication method to verify the authenticity of products, including associating to each product an electronic identification device having a unique identification code, selecting at least one piece of product information suitable to describe the product, associating to each identification code at least one respective and unique encryption key, encrypting the identification code and the product information, storing the encrypted content in the memory of the electronic identification device, obtaining the identification code and the encrypted content from the electronic identification device, decrypting the encrypted identification code using the encryption key corresponding to the obtained identification code, in case of correspondence between the decrypted identification code and the obtained identification code, decrypting the encrypted product information using the encryption key.