| 摘要 |
A method is provided for securely transmitting a digital message that is transmitted by means of an electronic letter service. A user of the service has a computer with a functioning browser and an Internet connection, and the electronic letter service makes use of a TrustCenter. The user creates a password using his/her browser. A user password verifier is cryptographically derived from the password. The user password verifier is transmitted to the electronic letter service and stored on a storage medium. A user secret is generated from the password by means of a cryptographic derivation. The user secret constitutes the symmetrical key for the encryption of a user-specific user master secret. The user secret is encrypted using the public key of the TrustCenter and the encrypted user secret is transmitted to the electronic letter service, from where it is then forwarded to the TrustCenter. |
