Hummm.... Victor ?
You can cipher and decipher what you want as well as with a RSA public
and private keys ;-)
If you cipher with the public key you have to use the private associate
key of course and vice versa.
Best regards,
Philippe
Victor Duchovni wrote:
On Thu, Dec 08, 2005 at 03:33:40PM -0600, Chevalier, Victor T. wrote:
I want to create a public key that is the same strength as the private
key.
Game over, the above demonstrates sufficiently deep confusion about RSA,
that you must not proceed any further until you see why it is absurd.
I need the public key to match the size constraints, as I am using then
to encrypt and decrypt and when I try to use the public key the bioerr
spits out"
RSA Public and private keys are not used to encrypt arbitrary data, there
are many complex traps to avoid because RSA is a commutative group. You
use RSA private keys to sign carefully constructed message digests that
avoid the various chosen plain-text attacks on RSA. You use RSA public
keys to encrypt randomly generated session keys that in turn encrypt
the message contents. All this specificed in carefully designed PKCS#N
standards that describe correct standard use-cases of RSA cryptography.
When I run my code using openssl I am trying to decrypt using my public
key,
I get:
3500:error:0406506C:rsa routines:RSA_EAY_PRIVATE_DECRYPT:data greater
than modlen:rsa_eay.c:308
I want to decrypt with the public key.
The public key is not suitable for decryption, it is only suitable for
signature verification. Decryption is only possible with the private
key and only if chosen-plaintext/chose-ciphertext attacks are carefully
avoided.
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