What is the variable key size range for RSA?

The variable key size range for RSA encryption has evolved over time as computing power has increased and security requirements have become more stringent. The correct choice reflects the current recommended key sizes for RSA.

RSA, which stands for Rivest-Shamir-Adleman, is a public-key cryptographic system that relies on the mathematical difficulty of factoring large integers. A key size of at least 1024 bits provides a basic level of security against traditional brute-force attacks. However, as technology advances, larger key sizes are recommended to ensure stronger security.

The range of 1024 to 4096 bits is widely accepted within the cryptographic community. A 2048-bit key is considered the minimum secure standard for current practices, while keys of up to 4096 bits are often used for high-security applications. This range effectively balances security and performance, accounting for future security requirements as computational limits are stretched.

In contrast, smaller key sizes, such as those in the lower range of options, have become less secure due to advancements in computational power, making them less favorable for protecting sensitive information. Therefore, the choice reflecting the 1024 to 4096-bit range aligns with best practices in the field of cryptography today.