Method for obtaining a secure authentification in clear text in a distributed information system environment

摘要

1. Method of obtaining at least one secure authentication in clear text (AT) by at least one requesting subject (S1) belonging to an information system (SY) comprising a plurality of subjects and an authority (AU) represented by at least one server (SAU) acting in its name. … …  -1) The requesting subject (S1) addresses a request for authentication to the authority (AU) and communicates to it at least one protection data item (CP), …  -2) The server (SAU) makes up the authentication (AT) and calculates the seal (SE) or the signature (SG) of the authentication (AT) by taking account of the first protection data item (CP), …  -3) The server transmits the sealed or signed authentication (AT) to the requesting subject (S1). … …??According to the invention, the method is characterised in that: … …  a) during a first step, the requesting subject (S1) chooses a control data item (CL) at random which it associates and links with the protection data item (CP) by a non-reversible relationship (Fcp) then transmits, in clear, to the authority (AU), on the one hand identification information defining the relationship, and on the other hand the protection data item (CP) itself, …  b) during the second step, the server inserts the protection data item (CP) and the identification information into the authentication (AT) and then calculates the seal (SE) or the signature (SG), …  c) during the third step, the latter transmits the authentication (AT) in clear text to the requesting subject (S1). … …??Applicable to computer systems. …IMAGE…