Re: Encryption size

From: Ertugrul Soeylemez (never_at_drwxr-xr-x.org)
Date: 10/29/05

  • Next message: Lassi Hippeläinen: "Re: Encryption size" 
    Date: Sat, 29 Oct 2005 10:22:49 +0200

    Lassi Hippeläinen <lahippel.at.ieee.org@moon.invalid> (Tue, 25 Oct 2005 15:16:12 +0300):
    > frank wrote:
    > > Can anyone tell me what size a 16-byte MD5 or 20-byte SHA-1 message
    > > digest will encrypt to using the RSA algorithm? Will they still be 16
    > > bytes or 20 bytes respectively? Or will they get any larger?
    >
    > They will be rounded up to the next full block. The block size is one design
    > parameter that you can choose within some limits.

    That's wrong. The new size will be the size of your RSA modulus. If
    you choose a 1024 bit key (which effectively means: a 1024 bit modulus),
    then the minimum block size will be that 1024 bits (1024/8 = 128
    bytes). It may be rounded up to some fixed block-size, but that's not
    RSA-specific, but implementation-specific.

    Regards.

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  • Next message: Lassi Hippeläinen: "Re: Encryption size"

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