Abstract: Certificate management method for a plurality of clients, the method including: receiving a first certificate for a subject including a public key, an issuer field with an issuer and a serial number field with a serial number, wherein the first certificate for the subject is signed by a first certificate for the issuer; generating a second certificate for the subject including the public key, an issuer field with the issuer and a serial number field with the serial number, wherein the second certificate for the subject is signed by a second certificate for the issuer being different to the first certificate for the issuer; and transmitting the second certificate for the subject to one of the plurality of clients; and performing an action on the basis of the public key of the second certificate for the subject.

Abstract: Certificate management method for a plurality of clients, the method including: receiving a first certificate for a subject including a public key, an issuer field with an issuer and a serial number field with a serial number, wherein the first certificate for the subject is signed by a first certificate for the issuer; generating a second certificate for the subject including the public key, an issuer field with the issuer and a serial number field with the serial number, wherein the second certificate for the subject is signed by a second certificate for the issuer being different to the first certificate for the issuer; and transmitting the second certificate for the subject to one of the plurality of clients; and performing an action on the basis of the public key of the second certificate for the subject.

Abstract: An end-to-end encryption method for emails sent from a sender (1) to a recipient (6) is disclosed. According to the method, the sender requests from an encryption system (16) a certificate corresponding to the recipient (6), and the encryption system (16) returns to the sender (11) a first, proforma certificate corresponding to the recipient (6). The sender (1) sends with his email client (11) an outgoing email to the recipient encrypted with the proforma certificate, and the email is forwarded through the encryption system (16). The encryption system (16) decrypts the email using a private key corresponding to the certificate and also makes the content of the email available to the recipient (6).

Abstract: A method for establishing a secure e-mail communication channel between a sender (10) and a recipient (5), wherein: 1) said sender sends an e-mail addressed to said recipient over an e-mail encryption system (16), 2) said encryption system (16) verifies in a database (160) of recipients if a public key of said recipient is available, 3) if said public key of said recipient is available, said encryption system encrypts said e-mail with said public key, and forwards the encrypted e-mail to the recipient (5), 4) if, on the other hand, said public key of said recipient is not available in said database (160), said encryption system sends instead enrolment message (1220) to said recipient, said enrolment message containing an invitation for said recipient to choose among one of the following options: i) access to said email over a secured web mail interface, or ii) sends a reply to said encryption system from which said public key can be extracted, or ii) initiate generation of a public key on the recipient's

Abstract: A method for establishing a secure e-mail communication channel between a sender (10) and a recipient (5), wherein: 1) said sender sends an e-mail addressed to said recipient over an e-mail encryption system (16), 2) said encryption system (16) verifies in a database (160) of recipients if a public key of said recipient is available, 3) if said public key of said recipient is available, said encryption system encrypts said e-mail with said public key, and forwards the encrypted e-mail to the recipient (5), 4) if, on the other hand, said public key of said recipient is not available in said database (160), said encryption system sends instead enrolment message (1220) to said recipient, said enrolment message containing an invitation for said recipient to choose among one of the following options: i) access to said email over a secured web mail interface, or ii) sends a reply to said encryption system from which said public key can be extracted, or ii) initiate generation of a public key on the recipient's

Abstract: End-to-end encryption method for emails sent from a sender (1) to a recipient (6), comprising the following steps: the sender requests from an encryption system (16) a certificate corresponding to said recipient (6), the encryption system (16) returns to said sender (11) a first, proforma certificate corresponding to said recipient (6), the sender (1) sends with his email client (11) an outgoing email to said recipient encrypted with said proforma certificate, said email is forwarded through said encryption system (16), said encryption system (16) decrypts said email using a private key corresponding to said certificate, said encryption system makes the content of said email available to said recipient (6).