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A symmetric cipher design contest was started in Ukraine around 2006, and this cipher (in Ukrainian and Russian: Мухомор) was there. For specifications, look for "Applied Radioelectronics" journal "Прикладная радиоэлектроника", 2007, No 2. http://anpre.org.ua/?q=pre_2007_2 http://dspace.nbuv.gov.ua/bitstream/handle/123456789/61794/06-Dolgov.pdf


To randomly guess a single key from a 128-bit key space has a chance of 1 divided by the number of elements or $\frac{1} {2^{128}}$ where $2^{128}$ is the number of keys possible. To get ballpark figures to convert between base 2 exponents and base 10 exponents you can use the following trick: Because $2^{10} = 1024 \approx 10^3$ you can easily count the ...


Yes, the problem of multicast one-way authentication can be solved using symmetric cryptography only, assuming (at least) one of the following applies (there might be other ways): we trust each receiving party to hold a common secret key secret, and not to use it nefariously; we accept overhead in the broadcasted message growing linearly with the number ...


The answer is to your problem is called Transport Layer Security with Pre-Shared Keys (TLS-PSK) and is widely available in implementations. TLS-PSK offers PKC aided and non-aided key-exchanges, with the former being recognizable by the DHE, ECDHE, RSA parts in their names. This means you want to look for the TLS_PSK_WITH_* cipher suites. In particular I'd ...

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