CMEA
| CMEA (Cellular Message Encryption Algorithm) | |
|---|---|
| developer | James A. Reeds III |
| Released | 1991 |
| Key length | 64 bit |
| Block size | 16 to 64 bits |
| Round | 3 |
| Best known cryptanalysis | |
| The algorithm is considered unsafe. Fractional with 338 selected plain text blocks in all block sizes. 40 to 80 known plain text blocks are sufficient to break a 24-bit block size and 4 known plain text blocks with 16-bit wide blocks. | |
The CMEA ( Cellular Message Encryption Algorithm ) is a block cipher which is used in American mobile radio systems and was developed by James A. Reeds in 1991 at AT&T . It is patented in U.S. Patent 5,159,634.
It is used to encrypt the control data in US cellular networks during radio transmission and has a similar area of application to the A5 algorithm used in Europe and in GSM cellular networks .
The algorithm is byte-oriented and can work with block sizes between two and six bytes. The key length is 64 bits. CMEA is considered unsafe.
Individual evidence
- ^ A b David Wagner , Bruce Schneier , John Kelsey : Cryptanalysis of the Cellular Message Encryption Algorithm . Santa Barbara, California August 1997, p. 526-537 ( Online - Advances in Cryptology - CRYPTO '97, 17th Annual International Cryptology Conference).
- ↑ U.S. Patent 5,159,634, October 27, 1992