troubleshooting Question

How long will an encryption key be in 30 years

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Milkus1Flag for Australia asked on
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I am trying to understand the correlation between encryption key length and processing speeds.
If I assume that the total processing speed of microprocessors (based on clock rate and number of circuits) is doubling roughly every year....and if a symmetric session key needs to be 100 bits long to be considered strong today. How long will a symmetric session key have to be in 10, 20 or even 30 years to be considered strong?
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