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**Unformatted text preview: **expected life time of the Sun is. Can you crack the key before that? According to 192bits key length the keyspace would be 2 192 = 6.277* 1057 possible keys Which will give us half of this amount for 50% of the keys : 50% of the keys = 0.5 * 6.277* 1057 = 3.1385 * 1057 The keys that can be calculated with the given machines in one year would be : 1,000,000*5,000,000 C1 per second Therefore, in one year = 5*1012*60*60*24*365 = 1.5768 * 1020 years The required time for decryption= 3.1385 * 1057 / 1.5768 * 1020 = 1.99 * 1037 Suns life is 5*109 years; therefore this time is not enough and much more time is needed even with the google servers! ...

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- Spring '17