RSA3072

RSA-3072 refers to a RSA public-key cryptosystem using a 3072-bit modulus. It is part of the RSA family and is used for public-key encryption and digital signatures, most commonly in digital certificates and secure communications.

Security properties: The security level of a 3072-bit RSA key is commonly estimated at about 128 bits for classical attackers, based on the hardness of the integer factorization problem (solved by the General Number Field Sieve). The exact security depends on padding, implementation, and operational parameters.

Standards and guidance: International standards organizations map RSA-3072 to roughly 128-bit security and recommend deploying at this size for operations requiring long-term protection. In practice, some deployments plan migration paths from 2048 bits to 3072 bits to balance security and performance.

Usage considerations: RSA keys of this size require more computing power for key generation, signing, and verification than shorter keys. In TLS, RSA can be used for signatures or as a key-exchange mechanism, but many protocols favor stronger key exchange like ECDHE with RSA signatures. Padding schemes such as OAEP (for encryption) and PSS (for signatures) are part of secure implementations; PKCS#1 v1.5 is discouraged for new designs.

Limitations and future: RSA-3072 is considered strong against classical attacks but is not resistant to quantum attacks; anticipated transition to post-quantum algorithms drives planning for future migrations.