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Assuming processing speed doubling every year, and assuming a symmetric session key needs to be 100 bits long to be considered strong today,<br />
then a symmetric session key would need to be 110 bits long to be considered strong in 10 years,<br />
120 bits in 20 years,<br />
130 bits in 30 years
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Assuming processing speed doubling every year, and assuming a symmetric session key needs to be 100 bits long to be considered strong today,
then a symmetric session key would need to be 110 bits long to be considered strong in 10 years,
120 bits in 20 years,
130 bits in 30 years

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Thanks ozo, I now get the concept. <br />
Double the speed requires just doubling the permutations possible.<br />
I &nbsp;how do I write this as a formula?
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Thanks ozo, I now get the concept.
Double the speed requires just doubling the permutations possible.
I  how do I write this as a formula?

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Thanks oro...much clearer now.
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I am trying to understand the correlation between encryption key length and processing speeds.<br />
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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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?

How long will an encryption key be in 30 years

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.