Changes compared to phase 1 : Py is left unchanged
compared to phase 1. The old phase 1 page can be found here. Additionnally, a new stream cipher Pypy is
proposed.
Cryptanalysis :
Hongjun Wu and Bart Preneel, "Attacking the IV Setup of Py and Pypy", pdf
Hongjun Wu and Bart Preneel, "Key Recovery Attack on Py and Pypy with Chosen IVs", pdf
Takanori Isobe, Toshihiro Ohigashi, Hidenori Kuwakado, and Masakatu Morii, "How to Break Py and Pypy by a Chosen-IV Attack", pdf
Souradyuti Paul and Bart Preneel, "On the (In)security of Stream Ciphers Based on Arrays and Modular Addition", pdf.
Gautham Sekar, Souradyuti Paul and Bart Preneel, "Weaknesses in the Pseudorandom Bit Generation Algorithms of the Stream Ciphers TPypy and TPy", pdf.
Eli Biham and Jennifer Seberry, "The Truth on TPy", pdf.
Other Articles :
Eli Biham and Jennifer Seberry, "Tweaking the IV Setup of the Py Family of Stream Ciphers -- The Ciphers TPy, TPypy, and TPy6", ps, submitted 2007-01-25.
