Apparatus and method for data encryption

摘要

Provided is an apparatus for encrypting data including a key determiner configured to determine a cipher key for white-box cryptography (WBC)-based encryption and a symmetric key different from the cipher key and an encrypter configured to generate a ciphertext of the data using the WBC-based encryption and symmetric-key-based encryption with the symmetric key.

主权项

1. An apparatus, intended for use in encrypting data, comprising:
a key determiner configured to determine a cipher key, for white-box cryptography (WBC)-based encryption, and a symmetric key different from the cipher key; an encrypter configured to generate a ciphertext of the data by applying the WBC-based encryption with the cipher key to a part of the data and by applying symmetric-key-based encryption with the symmetric key to another part, to which the WBC-based encryption is not applied, of the data, wherein the encrypter is further configured to generate the ciphertext so as to include: a symmetric-key-based ciphertext; and a WBC-based ciphertext adapted for use in decrypting the symmetric-key-based ciphertext; and one or more hardware processors implementing the key determiner and the encrypter.