# How do I classify my RSA encryption strength?

So I generated 2 1024 bit prime numbers, I generated N and got a 2048 bit number, does that make my encryption 2048 bit or 1024 bit?

• 2048 bit encryption Dec 23, 2015 at 4:03

The key length specified for RSA is the length of the modulus $n$ in bits. Thus, if you generate $n=p*q$ and get a 2048 bit modulus, your RSA encryption is 2048 bit.
If you want to have a good indication of key strength vs key size, you can take a look at keylength.com (e.g. NIST section). In the case of RSA you need to look at "Factoring Modulus". You'll see that the "minimum of strength" is $2^{112}$ for the modulus size - i.e. the key size - of 2048 bits.