Authors: | Mihaljević, Miodrag J. Fossorier, Marc P. C. Imai, Hideki |
Affiliations: | Mathematical Institute of the Serbian Academy of Sciences and Arts | Title: | Security evaluation of certain broadcast encryption schemes employing a generalized time-memory-data trade-off | Journal: | IEEE Communications Letters | Volume: | 11 | Issue: | 12 | First page: | 988 | Last page: | 990 | Issue Date: | 1-Dec-2007 | Rank: | M22 | ISSN: | 1089-7798 | DOI: | 10.1109/LCOMM.2007.071029 | Abstract: | In this letter a weakness of certain broadcast encryption schemes in which the protected delivery of a session key (SEK) is based on XOR-ing this SEK with the IDs of the keys employed for its encryption is addressed. The weakness can be effectively explored assuming passive attacking which in the cases corresponding to a malicious legitimate user being the attacker, is a ciphertext only attack. A dedicated algorithm for cryptanalysis is proposed based on a generalized time-memory-data trade-off approach and its main characteristics are derived. The developed algorithm points out a security weakness of employing a block cipher with block length shorter than the key length in the considered BE schemes. |
Keywords: | Broadcasting | Conditional data access control | Cryptanalysis | Cryptographic key management | Time-memorydata trade-off | Publisher: | IEEE | Project: | Advanced methods for cryptology and information processing |
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