You can use the complexity of the GNFS, the fastest known general-purpose factoring algorithm, to estimate the strength (in bits) of an RSA key size. Referencing the table linked above, a 1024-bit key has approximately 80 bits of strength, while a 2048-bit key has approximately 112 bits.

1024-bit RSA encryption cracked by carefully starving CPU Mar 09, 2010 https - Performance: 4096 Bit RSA-Key compared to 2048 bit sign verify sign/s verify/s rsa 1024 bits 0.000273s 0.000017s 3662.2 59513.0 rsa 2048 bits 0.001994s 0.000052s 501.5 19254.5 rsa 4096 bits 0.014438s 0.000219s 69.3 4560.3 So by doubling the key length, the time to sign a message increases by 7x, and the time to verify a signature increases by more than 3x. RSA 1024 - Ransomware Help & Tech Support

tls - 1024-bit DHE vs 2048-bit RSA - Information Security

A 1024-bit RSA key invocation can encrypt a message up to 117 bytes, and results in a 128-byte value A 2048-bit RSA key invocation can encrypt a message up to 245 bytes RSA, as defined by PKCS#1, encrypts "messages" of limited size,the maximum size of data which can be encrypted with RSA is 245 bytes.

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It generates RSA public key as well as the private key of size 512 bit, 1024 bit, 2048 bit, 3072 bit and 4096 bit with Base64 encoded. By default, the private key is generated in PKCS#8 format and the public key is generated in X.509 format. Generate RSA Key Online Select RSA Key Size RSA keys can be typically 1024 or 2048 bits long, but experts believe that 1024 bit keys could be broken in the near future. But till now it seems to be an infeasible task. Let us learn the mechanism behind RSA algorithm : Five algorithms can be provided; RSA_4096, RSA_3072, RSA_2048, RSA_1024, and RSA_512. RSA_1024 and RSA_512 are deprecated. To use RSA_1024 or RSA_512 (not recommended) you must set the database to database compatibility level 120 or lower. PROVIDER_KEY_NAME = 'key_name_in_provider' Specifies the key name from the external provider.