Method for creating and distributing cryptographic keys

A method for creating and distributing cryptographic keys for securing communication on two terminals, which comprises the steps of:

• distributing signals for creating correlated values in the two terminals via a first error-prone communication channel and the correlated values exist as keys in the two terminals;
• forming a first checksum on a basis of a first key present in a first terminal and the first checksum is transferred to a second terminal via a second communication channel different from the first error-prone communication channel;
• forming a second checksum based on a second key present in the second terminal and the first and second checksums, or a difference of the first and second checksums or information derived therefrom about the second communication channel, is transmitted to a server which is different from the first and second terminals and physically separated therefrom;
• determining, via the server, and on a basis of the first and second checksums or the difference of the first and second checksums or the information derived therefrom, a correction value, which when applied to one or both of the first and second keys brings the first and second keys into correspondence;
• and
• c) transmitting the correction value to one or both of the first and second terminals via the second communication channel and applied to one or both of the first and second keys.