The present invention relates to a communication method that includes an operation of receiving a succession of pages originating from a first site of a computer network. That method further includes an operation of memory storage of information representative of the succession of pages, outside the first site and an operation of associating a certificate of integrity with the memory-stored information representative of the succession of pages. The certificate of integrity is stored in memory in association with the information representative of the succession of pages. The certificate of integrity makes it possible to detect any alteration to the memory-stored information representative of the succession of pages, subsequent to its being stored in memory.