Differential Cryptanalysis of the Stream Ciphers Py, Py6 and Pypy
نویسندگان
چکیده
A multi-year project to identify new stream ciphers that might become suitable for widespread adoption
منابع مشابه
Differential Cryptanalysis of the Stream Ciphers
This paper shows that Py and Pypy are practically insecure. If one key is used with about 2 IVs with special differences, with high probability two identical keystreams will appear. This can be exploited in a key recovery attack. For example, for a 16-bye key and a 16-byte IV, 2 chosen IVs can reduce the effective key size to 3 bytes. For a 32-bye key and a 32-byte IV, the effective key size is...
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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. However, due to some cryptanalytic results on the ciphers, strengthened versions of the ciphers, namely TPy, TPypy and TPy6 were built. So far there exists no attacks on TPy6. In this paper, we fin...
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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. However, due to some cryptanalytic results on the ciphers, strengthened versions of the ciphers, namely TPy, TPypy and TPy6 were built. So far there exists no attacks on TPy6. In this paper, we fin...
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The stream ciphers Py, Py6 were designed by Biham and Seberry for the ECRYPT-eSTREAM project in 2005. However, due to several recent cryptanalytic attacks on them, a strengthened version Pypy was proposed to rule out those attacks. The ciphers have been promoted to the ‘Focus’ ciphers of the Phase II of the eSTREAM project. The impressive speed of the ciphers make them the forerunners in the co...
متن کاملRelated-Key Attacks on the Py-Family of Ciphers and an Approach to Repair the Weaknesses
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. Under related keys, we show a distinguishing attack on ...
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