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2009-02-10 Tue
■ key2_0 を推測
key2_1 の定義
key2_1 = crc32 (key2_0, MSB(key1));
= crc32(key2_0,0) ^ crctab[MSB(key1)]
key2_0 = (key2_1 << 8) ^ crcinvtab[MSB(key2_1)] ^ MSB(key1)
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