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New Weaknesses in the Keystream Generation Algorithms of the Stream Ciphers TPy and Py [chapter]

Gautham Sekar, Souradyuti Paul, Bart Preneel
Lecture Notes in Computer Science  
However, even the new cipher Pypy was not free from flaws, resulting in a second redesign. This led to the generation of three new ciphers TPypy, TPy and TPy6.  ...  The stream ciphers Py, Py6 designed by Biham and Seberry were promising candidates in the ECRYPT-eSTREAM project because of their impressive speed.  ...  Attacks on Py The PRBG of the cipher Py is identical with that of TPy. The attacks described in the previous sections exploit the weaknesses in the PRBG of TPy only.  ... 
doi:10.1007/978-3-540-75496-1_17 fatcat:zd4omzdyozdcdj4ext3fa4wtn4

Related-Key Attacks on the Py-Family of Ciphers and an Approach to Repair the Weaknesses [chapter]

Gautham Sekar, Souradyuti Paul, Bart Preneel
Lecture Notes in Computer Science  
The stream cipher TPypy has been designed by Biham and Seberry in January 2007 as the strongest member of the Py-family ciphers, after weaknesses in the other members Py, Pypy, Py6 were discovered.  ...  One main contribution of the paper is the detection of related-key weaknesses in the Py-family of ciphers including the strongest member TPypy.  ...  Sekar, Paul and Preneel showed new weaknesses in the stream ciphers TPy and Py [23] .  ... 
doi:10.1007/978-3-540-77026-8_6 dblp:conf/indocrypt/SekarPP07 fatcat:uekhv7mtdrb3tivcuzu2smqzyy

New Attacks on the Stream Cipher TPy6 and Design of New Ciphers the TPy6-A and the TPy6-B [chapter]

Gautham Sekar, Souradyuti Paul, Bart Preneel
Lecture Notes in Computer Science  
In this paper, we find hitherto unknown weaknesses in the keystream generation algorithms of the Py6 and of its stronger variant TPy6.  ...  The stream ciphers Py, Pypy and Py6 were designed by Biham and Seberry for the ECRYPT-eSTREAM project in 2005. The ciphers were promoted to the 'Focus' ciphers of the Phase II of the eSTREAM project.  ...  New Ciphers: TPy6-A and TPy6-B The Py-family of stream ciphers has been subject to extensive analysis ever since Py and Py6 were proposed in April 2005.  ... 
doi:10.1007/978-3-540-88353-1_11 fatcat:u5cnieamynf7jidl5ix4etofrm