Data transfer between two data processing units

Abstract

The invention relates to a method for data transfer between two data processing units (100, 200). In this case, a secret key is generated, the secret key is encrypted using an additional key (12) provided from a first external storage medium (10), and the encrypted secret key (14) is stored on the first external storage medium (10). Data (1) stored on a first data processing unit (100) are encrypted using the secret key, and the data (2) encrypted using the secret key are provided to a second data processing unit (200). The encrypted secret key (14) and the additional key (12) are read from the first external storage medium (10) by the second data processing unit (200) and the encrypted secret key (14) is decrypted by the second data processing unit (200) with the aid of the additional key (12). The data (2) encrypted using the secret key are decrypted by the second data processing unit (200) with the aid of the secret key.

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