Abstract: A process for the generation of an advanced electronic signature of an electronic document (4) using a signature creation unit (1) comprises the generation of unambiguous user identification data (BI) of a signer; the generation of a one-time used session key (SK); the encryption (BI_crypt) of the user identification data (BI) with the session key (SK); the asymmetric encryption (SK_crypt) of the session key (SK) with a public key (OSK) of a signature server (2); the linking of the electronic document (4), of the encrypted (BI_crypt) user identification data (BI) and of the encrypted (SK_crypt) session key (SK) into a data stream and the formation of an original hash value (OH) from the data stream using a hash algorithm; the generation of a one time certificate key pair (PCZ, OCZ); the generation of a digital client signature (DCS) by encrypting the original hash value (OH) with the private key (PCZ) of the one time certificate key pair; the generation of a digital seal (6, 6?) containing the encrypted (BI_c

Abstract: Dye mixtures containa) one or more azo dyes of the formula I ##STR1## where Y.sup.1 is hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.4 -alkoxy or unsubstituted or substituted C.sub.1 -C.sub.8 -alkanoylamino or C.sub.3 - or C.sub.4 -alkenylamino orY.sup.2 and Y.sup.3 are each hydrogen or unsubstituted or substituted C.sub.1 -C.sub.6 -alkylb) the azo dye of the formula II ##STR2## where L is allyl which may be partially replaced by or may furthermore be hydrogen andc) optionally, an azo dye of the formula III and/or IV as described in the specification.