|Designers||X. Yi, C.H. Tan, C.K. Siew, and M.R. Syed|
|Key sizes||about 4094.2 bits|
|Block sizes||4096 bits|
|Best public cryptanalysis|
|Youssef and Tavares break it with 1 known plaintext and 2 chosen plaintexts|
With the unusually large block size of 4096 bits, all of FEA-M's calculations operate on 64×64 binary matrices. Unlike most block ciphers, FEA-M does not use multiple rounds of encryption. Each block is encrypted using just two multiplications and two additions. The data is encrypted using a pair of session keys chosen for just that message. The key is an invertible matrix used to encrypt the session keys, and the encrypted session keys must be sent along with the ciphertext. Since only invertible matrices can be used for the key, the effective key size is about 4094.2 bits.
- Hongjun Wu; Feng Bao; Robert H. Deng (October 2003). An Efficient Known Plaintext Attack on FEA-M (PDF). 5th International Conference on Information and Communication Security (ICICS 2003). Huhehaote: Springer-Verlag. pp. 34–46. Retrieved 31 December 2006.
- Li, Shujun; Lo, Kwok-Tung (14 June 2006). "Security problems with improper implementations of improved FEA-M". Journal of Systems and Software. 80 (5): 791–794. arXiv:cs.cr/0509036. CiteSeerX 10.1.1.134.6135. doi:10.1016/j.jss.2006.05.002. Archived from the original on 9 September 2012. Retrieved 14 December 2007.
- Mihaljevic, M.J. (November 2003). "On vulnerabilities and improvements of fast encryption algorithm for multimedia FEA-M". IEEE Transactions on Consumer Electronics. 49 (4): 1199–1207. doi:10.1109/TCE.2003.1261217.
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