is a synchronous stream cipher
supporting the key lengths of 80 bits and 128 bits, respectively.
ACHTERBAHN-128 is downward compatible and can produce the same
keystream as ACHTERBAHN-80 if so desired.
|Max. key size||80 bit||128 bit
|Max. IV size||80 bit||128 bit
|Internal state||297 bit||351 bit
|Frame length||244 bit||244 bit
The Achterbahn stream cipher is optimized for hardware applications with restricted resources, such as
limited gate count and power consumption.
An implementation of ACHTERBAHN-80 has a design size of only 2188
gate equivalents (Nand-GE) for throughputs upto 400Mbit/s and is suited for RFID tags.
A high-speed implementation with a throughput of 8 Gbit/s has a design size of 8651 Nand-GE,
Achterbahn is a joint work of Berndt Gammel, Rainer Göttfert and Oliver Kniffler.
Read also the Wikipedia article.