Minmum Key Length for Block Ciphers Required keeping in view futuristic quantum computers

Asked Sep 14 '17 at 07:16

Active Sep 14 '17 at 07:16

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256 bits is considered secure forever, even in the face of futuristic quantum computers

is it true? or i can consider 128 or 192 bits secure as well keeping in view the futuristic quantum computers? or it should be more than 256 bits?

asked Sep 14 '17 at 07:16

crypt

It is my personal opinion, that for quantum-proofing (forever), you need 576-bits. – Richie Frame Sep 14 '17 at 09:58
Relevant (recent) paper which says that the time-2 strategy for quantum-proofing is quite heavily on the conservative side of things. – SEJPM Sep 14 '17 at 10:03
so to be on safe side just double the symmetric key length? – crypt Sep 14 '17 at 11:54

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