The invention relates to a method for providing pseudonymous keys for a hybrid encryption method and to a device, wherein the method comprises providing a public key for a sender, wherein the public key is generated on the basis of a private key and a sender-specific basis, receiving an intermediate key, wherein the intermediate key is generated by the sender on the basis of the sender-specific basis and a secret of the sender, and reconstructing a symmetric key on the basis of the intermediate key and the private key in order to decrypt a message encrypted by the sender by means of the symmetric key, wherein the symmetric key is generated by the sender on the basis of the public key and the secret of the sender. The invention further relates to a method for using pseudonymous keys in a hybrid encryption method, to a hybrid encryption method, to a sender, and to a system.
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