Re: Encryption size

From: Ertugrul Soeylemez (never_at_drwxr-xr-x.org)
Date: 10/30/05

  • Next message: Lassi Hippeläinen: "Re: Encryption size" 
    Date: Sun, 30 Oct 2005 05:21:49 +0100

    Lassi Hippeläinen <lahippel.at.ieee.org@moon.invalid> (Sat, 29 Oct 2005 12:03:41 +0300):
    > RSA can be seen as a block cipher. The block size is the size of the
    > modulus, which you can choose.

    You can't really tell if RSA is a block cipher or not. A block is a
    fixed number of of units. If you define a unit to be a byte, then it is
    a block cipher, but you can as well define a unit to be one cleartext
    unit, which is just a large number. In that case, RSA is not a block
    cipher.

    -----
    Public key "Ertugrul Soeylemez <never@drwxr-xr-x.org>" (id: CE402012)
    Fingerprint: 0F12 0912 DFC8 2FC5 E2B8 A23E 6BAC 998E CE40 2012

    HKP: hkp://subkeys.pgp.net/
    LDAP: ldap://keyserver.pgp.com/
    HTTP: http://www.keyserver.de/

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

    Relevant Pages

    • Re: Encryption size
      ... Ertugrul Soeylemez wrote: ... > You can't really tell if RSA is a block cipher or not. ... The only meaningful way to define RSA block size is the size of the modulus, ...
      (comp.security.misc)
    • Re: newbie Qs about RSA, OAEP
      ... just say use 2048-bit RSA keys and not worry about it [worry about the rest ... > RSA block, you encrypt the message with a block cipher, and encrypt only ... > the keys (the block cipher key, the MAC key, maybe the IV if there is ...
      (sci.crypt)
    • Re: newbie Qs about RSA, OAEP
      ... > Are there recommended minimum/maximum lengths for RSA keys? ... RSA block, you encrypt the message with a block cipher, and encrypt only ... each protocol has its own way of indicating length. ...
      (sci.crypt)
    • Re: Encryption size
      ... >> You can't really tell if RSA is a block cipher or not. ... the underlying data representation. ... This doesn't hurt RSA, but it ...
      (comp.security.misc)