Re: OpenSSH authentication key lengthFrom: Richard E. Silverman (email@example.com)
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From: firstname.lastname@example.org (Richard E. Silverman) Date: 29 Mar 2002 02:56:13 -0500
> -b bits
> Specifies the number of bits in the key to create.
> Minimum is 512 bits. Generally 1024 bits is considered
> sufficient, and key sizes above that no longer improve
> security but make things slower. The default is 1024
> But doesn't longer key provide stronger security?
Suppose that, according to the state of the art in computing hardware and
current understanding of practical attacks on a particular cipher, a n-bit
key requires longer than the age of the universe to crack. Then a 2n-bit
key does not increase security in any meaningful way, but simply slows
-- Richard Silverman email@example.com