Extending the Salsa20 nonce
نویسنده
چکیده
This paper introduces the XSalsa20 stream cipher. XSalsa20 is based upon the Salsa20 stream cipher but has a much longer nonce: 192 bits instead of 64 bits. XSalsa20 has exactly the same streaming speed as Salsa20, and its extra nonce-setup cost is slightly smaller than the cost of generating one block of Salsa20 output. This paper proves that XSalsa20 is secure if Salsa20 is secure: any successful fast attack on XSalsa20 can be converted into a successful fast attack on Salsa20.
منابع مشابه
Salsa20 security
If the Salsa20 key k is a uniform random sequence of bytes, and the same nonce is never used for two different messages, then the Salsa20 encryption function is conjectured to produce ciphertexts that are indistinguishable from perfect ciphertexts, i.e., uniform random strings independent of the plaintexts. At a lower level, the random function n 7→ Salsa20k(n) from {0, 1, . . . , 255} 16 to {0...
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تاریخ انتشار 2008