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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