US Patent 9288044 Method for providing cryptographic key pairs

The invention relates to a method for creating a second asymmetric cryptographic pair of keys, wherein a first private key (G0) together with a first public key (O0) forms a first asymmetric cryptographic pair of keys (K0). Embodiments of the method may comprise the following steps: receiving a user identifier; calculating a second private key (G1), wherein a random value (z) and the user identifier are considered in the calculation; calculating a second public key (O1) from the second private key using an asymmetric cryptographic key creation method, wherein the second private key and the second public key form the second asymmetric cryptographic pair of keys (K1, 206); creating a first cipher (C_G0—O1) by encrypting the first private key (G0) with the second public key (O1); and storing the first cipher (C_G0—O1).