Abstract: The invention relates to a computer implemented method for performing a user authentication, wherein an asymmetric cryptographic key pair is associated with the user, said key pair comprising a public key and a private key, wherein the method comprises selecting the user to be authenticated using a pseudonym of said user, wherein said pseudonym comprises the public key of the user, the method further comprising performing a cryptographic authentication of the user using the asymmetric cryptographic key pair.

Abstract: The invention pertains to a method, computer readable medium, and data processing system for generation of an asymmetric cryptographic key pair including reception of an arbitrarily selectable login name, calculation of a first data object key, whereby a random value and the login name are included in the calculation, and calculation of a second data object key from the first data object key, whereby the first and second data object keys form the asymmetric cryptographic key pair.

Abstract: The invention relates to a method for creating a second asymmetric cryptographic pair of keys (206), wherein a first private key (G0, 154) together with a first public key (O0, 126) forms a first asymmetric cryptographic pair of keys (K0, 218), wherein the method comprises 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 ciphertext (C_G0—O1, 212; 186) by encrypting the first private key (G0) with the second public key (O1); storing the first ciphertext (C_G0—O1, 212; 186).

Abstract: The invention relates to a method for creating a set of asymmetrical cryptographic key pairs, wherein the set of key pairs has a first key pair (K1) and a second key pair (K2), wherein the first key pair is formed by a first private (G1) and a first public key (O1) and the second key pair is formed by a second private (G2) and a second public key (O2), wherein a first cipher (C_G2_O1) is allocated to the first and second key pair, wherein the first cipher is formed by an encryption of the second private key (G2) with the first public key (O1), having the following steps: adding a third asymmetrical cryptographic key pair (K3) to the set of key pairs, wherein the third key pair is formed by a third private (G3) and a third public key (O3); creating a second cipher (C_G3_O1) by encrypting the third private key (G3) with the first public key (O1); storing the second cipher (212; 186), wherein the set of key pairs has a directed graph structure.

Abstract: An apparatus for encrypting data is provided. The apparatus has a means for symmetrically encrypting data and a means for encrypting the symmetrically encrypted data with the aid of a bit string. The bit string has a maximum entropy. The means for encrypting the symmetrically encrypted data is designed such that a section of the bit string is used for encryption and successive encryption operations are carried out with varying sections of the bit string while the bit string remains unchanged.

Abstract: The invention pertains to a method, computer readable medium, and data processing system for generation of an asymmetric cryptographic key pair including reception of an arbitrarily selectable login name, calculation of a first data object key, whereby a random value and the login name are included in the calculation, and calculation of a second data object key from the first data object key, whereby the first and second data object keys form the asymmetric cryptographic key pair.

Abstract: The invention relates to a communication method of an electronic health insurance card (122) with a reading device. A communication link is established between the electronic health insurance card (122) and the reading device (110), said communication link being a near-field link.

Abstract: The invention relates to a computer implemented method for generating a set of identifiers from a private key, the method comprising the steps of: calculating a set of public keys, wherein the private key and each public key of the set of public keys form an asymmetric cryptographic key pair; and outputting the identifiers comprising the public keys.

Abstract: A computer readable storage medium having stored therein instructions, which when executed by a computing device cause the computing device to perform a method of generating an access key, the method comprising the steps of: accessing an input value; calculating an asymmetric cryptographic key pair by applying a cryptographic one-way function to the input value, wherein the cryptographic key pair comprises a public key and a private key, wherein the cryptographic one-way function is an injective function; and outputting the public key for providing the access key.

Abstract: The invention relates to a computer implemented method for sending a message to a recipient user, wherein a recipient asymmetric cryptographic key pair is associated with the recipient user, said key pair comprising a public recipient key and a private recipient key, the method comprising sending the message to said recipient user with the recipient address to which the message is sent comprising the public recipient key.

Abstract: The invention relates to a computer implemented method for generating a pseudonym for a user comprising entering a user-selected secret, storing the user-selected secret in memory, computing a private key by applying an embedding and randomizing function onto the secret, storing the private key in the memory, computing a public key using the private key, the public key and the private key forming an asymmetric cryptographic key, erasing the secret and the private key from the memory, and outputting the public key for providing the pseudonym

Abstract: The invention relates to a computer implemented method for performing a user authentication, wherein an asymmetric cryptographic key pair is associated with the user, said key pair comprising a public key and a private key, wherein the method comprises selecting the user to be authenticated using a pseudonym of said user, wherein said pseudonym comprises the public key of the user, the method further comprising performing a cryptographic authentication of the user using the asymmetric cryptographic key pair.

Abstract: The invention relates to a method of generating a pseudonym, the method including accessing an input value and calculating a pseudonym by applying a cryptographic one-way function to the input value, where the cryptographic one-way function is an injective function.

Abstract: The invention relates to a method for decoding a medicinal data object (132) by means of a data processing system (100). The medicinal data object is encoded by means of a data object key, a signature is allocated to said data object key and the data object key is encoded by means of a first health insurance card key (138). Said medicinal data object is allocated to the first health insurance card key (138) and said method comprises the following steps: a secure communication channel is established with the mobile telecommunication device (116), the telecommunication device (116) is designed to be used as an electronic health insurance card, the first health insurance card key (138) is allocated to the mobile telecommunication device (116), the data object key coded by the health insurance card key (138) is sent to the telecommunication device (116), the decoded data object key is captured by the telecommunication device (116), and the medicinal data object (132) is decoded by the coded data object key.

Abstract: A data processing system includes: means for accessing a medical case database; means for entering case-related data in the case database; means for accessing a medical specialty questions database; means for generating a query for the specialty questions database with the help of the case-related data; means for displaying a specialty question obtained by the query; means for entering an answer to the specialty question; and means for evaluating an answer.