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In 2007, Kim et al. proposed a secure compression code called the secure arithmetic code (SAC). The code was claimed to be secure against chosen plaintext attacks. However, we find that the SAC is not as secure as the authors have claimed. In this paper, we show the code is prone to two attacks. The first attack completely breaks the code using an adaptive chosen plaintext attack with a polynomial...
In elementary arithmetic, after acquiring the concept and basic procedures of multiplication, fluency in multiplication facts in the times table then becomes the basis for computing more complex multiplications, for example, multiplying two 2-digit numbers. A dyad game in one-to-one technology enhanced classroom environment, called Honeycomb, is designed for developing the fluency of multiplication...
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