How do I find my RSA key size?
Go to the Security tab and click on View Certificate.
- You’ll see three tabs on the top of the page.
- The first would be the website’s name.
- In the Public Key Info, you’ll see information relating to the algorithm (in this example, it’s the RSA algorithm) and the SSL key size (which is 2048 bits for digicert.com).
Why are the RSA pubic keys so much longer than keys in a symmetric key eg 1024 bits vs 128 bits of AES choose?
Typical RSA key sizes are 1,024 or 2,048 or 4,096 bits. That number is the number of bits in the modulus. That’s because there are only so many prime numbers of that size and below. The RSA scheme can only use pairs of prime numbers, whereas the symmetric schemes can use any number at all of the same size.
How big is the public key for RSA?
Especially NIST SP-800-38 yields good data for your question. For 112 bit security (which is about the minimum you should use for not extremely important things) you currently (2016) have to use RSA-2048 keys, 2048 bit DH groups or 224 bit elliptic curves. Thanks for contributing an answer to Cryptography Stack Exchange!
What does it mean when RSA key has length 2048?
When a RSA key is said to have length “2048”, it really means that the modulus value lies between 2 2047 and 2 2048. Since the public and private key of a given pair share the same modulus, they also have, by definition, the same “length”.
Which is better RSA or ECDSA key size?
You’re better off not using RSA if you can help it. Use, in order of preference: Ed25519 (for which the key size never changes). ECDSA with secp256r1 (for which the key size never changes). RSA with 2048-bit keys. Everything we just said about RSA encryption applies to RSA signatures.
Which is the best encryption key for RSA?
Currently (as of 2017-05-11) 2048-bit keys are most popular for use with RSA, and 2048 bit keys should also be used with classic Diffie-Hellman. These offer about the same security as a symmetric encryption algorithm with 112 bits of security.