[Cryptography] information, Shannon, and quantum mechanics

[Ryan Carboni]

128-bit keys are secure from quantum computers, given that agencies could
potentially bruteforce 80-bit keys, and grover's alg reduces 128-bit
security to 64-bit, the cost of a single quantum evaluation of AES must be
equal to or less than 2^16 the cost of a classical computation of AES.

No worries there! Apparently buying a quantum computer with hundreds or
thousands of gates (no recent news articles about the current state of the
art), costs millions.

So we're quite safe.
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