Method of securing a given original article of a batch of a plurality of original articles (A 1 , A 2 , A 3 ) against forgery or tampering, each original article of the batch having its own associated article data and corresponding article digital data (D 1 , D 2 , D 3 ), characterized by comprising the steps of: for each original article of the batch, calculating by means of a one-way function an associated article digital signature (x 1 , x 2 , x 3 ) of its corresponding article digital data; calculating a reference aggregated digital signature (B) corresponding to the batch of original articles from all the article digital signatures of the original articles of the batch by means of a one-way accumulator of said article digital signatures, and making available to a user the reference aggregated digital signature; determining an article verification key (k i ) corresponding to the article digital signature of said given original article by means of a partial one-way accumulator of all the other article digital signatures used for calculating the reference aggregated digital signature, whereby a candidate article digital signature corresponds to that of an original article of the batch only if the reference aggregated digital signature is calculated from said candidate article digital signature and corresponding article verification key by means of the one-way function; and applying on the given original article a corresponding machine readable security marking including a representation of its associated article digital data and its corresponding article verification key, both included into the machine readable security marking via encoding, thereby obtaining a marked original article of which article data is secured against forgery or tampering. for each original article of the batch, calculating by means of a one-way function an associated article digital signature (x 1 , x 2 , x 3 ) of its corresponding article digital data; calculating a reference aggregated digital signature (B) corresponding to the batch of original articles from all the article digital signatures of the original articles of the batch by means of a one-way accumulator of said article digital signatures, and making available to a user the reference aggregated digital signature; determining an article verification key (k i ) corresponding to the article digital signature of said given original article by means of a partial one-way accumulator of all the other article digital signatures used for calculating the reference aggregated digital signature, whereby a candidate article digital signature corresponds to that of an original article of the batch only if the reference aggregated digital signature is calculated from said candidate article digital signature and corresponding article verification key by means of the one-way function; and applying on the given original article a corresponding machine readable security marking including a representation of its associated article digital data and its corresponding article verification key, both included into the machine readable security marking via encoding, thereby obtaining a marked original article of which article data is secured against forgery or tampering. <EOS>