encrypt/sign 2048 bit RSA key using another Rsa 2048 bit Key

[Werner Koch]

On Thu, 10 Aug 2006 14:25, Vinod Jacob said:

> what is the maximum size of the buffer that i can encrypt using 2048
> bit key.is it 2048 bit ?

Please read some basic literature about applied cryptography.
Libgcrypt can't help you unless you have a basic knowledge.

@Book{Sch:96:AC,
  author =      "Bruce Schneier",
  title =       "Applied Cryptography",
  language =    "USenglish",
  edition =     "second",
  publisher =   pub-WIL,
  address =     pub-WIL:adr,
  pages =       "xxiii + 758",
  year =        "1996",
  ISBN =        "0-471-11709-9",
}

is good for an overview.

@Book{Men:96:HAC,
  author =      "Alfred J. Menezes and Paul van Oorschot and
                 Scott Vanstone",
  title =       "Handbook of Applied Cryptography",
  language =    "USenglish",
  publisher =   pub-CRC,
  address =     pub-CRC:adr,
  pages =       "xxvii + 780",
  year =        "1996",
  ISBN =        "0-8493-8523-7",
  keywords =    "cryptograpy",
}

Is what you need to read if you want to implement low-level stuff.

@Book{Fer:03:PC,
  author =      "Niels Ferguson and Bruce Schneier",
  title =       "Practical Cryptography",
  language =    "USenglish",
  edition =     "first",
  publisher =   pub-WIL,
  address =     pub-WIL:adr,
  pages =       "xx + 410",
  year =        "2003",
  ISBN =        "0-471-22357-3",
  URL =         "http://www.macfergus.com/pc/"
}

Is what you really need to read.


Shalom-Salam,

   Werner