A method for securing data and safeguarding the data origin, wherein the data are transmitted electronically encrypted from a customer device to a center, the method including the following steps: i) generating and storing in memory an RSA key pair, comprising a first key (Sa) and a second key (Pa), for signing customer certificates in the center; ii) generating and storing in memory two RSA key pairs for the customer device, comprising a third key of the customer device (Sc) and a fourth key of the customer device (Pc) as well as a first key encryption key (St) and a second key encryption key (Pt), the first key encryption key (St) and the second key encryption key (Pt) being suitable for secure transportation of the third key of the customer device (Sc); iii) generating an encrypted key by encrypting the third key of the customer device (Sc), using the second key encryption key (Pt), and generating a customer certificate in the center by encrypting the customer-specific telephone number and the IMEI of the customer device and/or a customer number, using the fourth key of the customer device (Pc), and ensuing encryption using the first key (Sa) for signing customer certificates; iv) transmitting the encrypted key and the customer certificate to the customer device; v) sending the first key encryption key (St) to the customer device in response to a request by the customer device; vi) decrypting the encrypted key using the first key encryption key (St) in the customer device, whereupon the third key of the customer device (Sc) is obtained; characterised in that it includes the steps: vii) encrypting a randomized sequence of numbers in the center using the fourth key of the customer device (Pc); viii) sending the encrypted randomized sequence of numbers to the customer device; ix) decrypting the encrypted randomized sequence of numbers in the customer device, using the third key of the customer device (Sc); x) encrypting a first PIN input at the customer device, using the third key of the customer device (Sc), to a ciphertext; xi) sending the ciphertext and the customer certificate to the center; xii) decrypting the ciphertext in the center, using the fourth key of the customer device (Pc), decrypting the first PIN input, and checking the customer certificate sent, using the customer certificate stored in memory in the center. i) generating and storing in memory an RSA key pair, comprising a first key (Sa) and a second key (Pa), for signing customer certificates in the center; ii) generating and storing in memory two RSA key pairs for the customer device, comprising a third key of the customer device (Sc) and a fourth key of the customer device (Pc) as well as a first key encryption key (St) and a second key encryption key (Pt), the first key encryption key (St) and the second key encryption key (Pt) being suitable for secure transportation of the third key of the customer device (Sc); iii) generating an encrypted key by encrypting the third key of the customer device (Sc), using the second key encryption key (Pt), and generating a customer certificate in the center by encrypting the customer-specific telephone number and the IMEI of the customer device and/or a customer number, using the fourth key of the customer device (Pc), and ensuing encryption using the first key (Sa) for signing customer certificates; iv) transmitting the encrypted key and the customer certificate to the customer device; v) sending the first key encryption key (St) to the customer device in response to a request by the customer device; vi) decrypting the encrypted key using the first key encryption key (St) in the customer device, whereupon the third key of the customer device (Sc) is obtained; characterised in that it includes the steps: vii) encrypting a randomized sequence of numbers in the center using the fourth key of the customer device (Pc); viii) sending the encrypted randomized sequence of numbers to the customer device; ix) decrypting the encrypted randomized sequence of numbers in the customer device, using the third key of the customer device (Sc); x) encrypting a first PIN input at the customer device, using the third key of the customer device (Sc), to a ciphertext; xi) sending the ciphertext and the customer certificate to the center; xii) decrypting the ciphertext in the center, using the fourth key of the customer device (Pc), decrypting the first PIN input, and checking the customer certificate sent, using the customer certificate stored in memory in the center.