The 2048-bit is about the RSA key pair: RSA keys are mathematical objects which include a big integer, and a "2048-bit key" is a key such that the big integer is larger than 22047 but smaller than 22048. The 256-bit is about SSL.

a 2048-bit key is 2048-bit long, it is counted with the binary system. You can represent it with 617 decimal digits using the decimal system. You can also represent it with a 256-character ASCII string. Also, AFAIK, this question is off-topic.

2020年5月23日 · ECDH with secp256r1 (for which the key size never changes) then symmetric encryption. RSA with 2048-bit keys. The security of a 256-bit elliptic curve cryptography key is about even with 3072-bit RSA. Although many organizations are recommending migrating from 2048-bit RSA to 3072-bit RSA (or even 4096-bit RSA)

According to PGP, the company, a 2,048 bit RSA key is equivalent to a 112 bit symmetric key. A 3,072 bit RSA key is equivalent to 128 bits. According to NIST, 2,048 bits should be "good enough" until about the year 2030. beyond that, an RSA key length of …

2019年3月28日 · I have to ensure that the server when communicating on the Internet needs to have DH prime value of 2048 bits or greater. I can find out the cipher suites that are used but cannot derive the DH p...

2015年4月5日 · I am new to cryptography. I have an api provided by a bank. The banks says that they are using RSA algorithm with 2048 bits. We used this api first to get the public key. Here is the sample public ...

2015年5月27日 · Traditionally, the "length" of a RSA key is the length, in bits, of the modulus. 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".

2014年2月12日 · As you all know, plenty of X.509 Certificates use (PKCS#1 SHA1 with RSA encryption) as the Certificate Signature Algorithm for generating the signature of 2048 Bits long. We know that SHA1 hash function generates a hash value of 160 bits, so this makes the 2048 Bits Certificate Signature Value a combination of (160 bits + 1888 bits = 2048 Bits).

2023年10月12日 · The best known attack on RSA and traditional diffe-hellman uses the same basic algorithm, so RSA and traditional diffe-hellman give a similar "strength" for a given key length. 1024 bit RSA is generally seen as offering roughly 80 bits of security which is now considered within the range of well-funded attackers.

2014年8月12日 · I'd rather use 2048 bit RSA for signing together with ECDH for key exchange instead of larger RSA for encryption. Unlike encryption/key-exchange keys, signing keys don't need long term security so 2048 is fine.