# Re: RSA question

*From*: Mark Wooding <mdw@xxxxxxxxxxxxxxxx>*Date*: Fri, 20 Feb 2009 15:37:36 +0000

sluijten@xxxxxxxxx writes:

OK math guys, what's the overall conclusion, can I use RSA for this?

In other words: is there a major security issue when I use a private

key to encrypt and a public key for decryption?

The idea is simply absurd. The notion of `encryption' implies some

security requirements. Those requirements cannot be met if you also

want the general public to able to decrypt.

My best guess is that you want a digital signature scheme. If you do,

you should say so. If you don't, you should state the /security

requirements/ of what you want.

RSA is not an encryption scheme. RSA is not a digital signature

scheme. RSA is a trapdoor one-way permutation family. Trapdoor one-way

permutation families can be used to construct encryption schemes and

digital signature schemes.

-- [mdw]

.

**References**:**RSA question***From:*sluijten

**Re: RSA question***From:*bert

**Re: RSA question***From:*Bryan Olson

**Re: RSA question***From:*sluijten

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