aes-encryption.com
English

AES · GCM / CBC / CTR

AES vs RSA: Different Jobs in an Encryption System

Distinguish symmetric AES from asymmetric RSA, hybrid encryption and the limits of a standalone browser AES tool.

One shared key or a key pair

AES is symmetric: the parties use the same secret key for encryption and decryption. RSA is asymmetric and uses a public/private key pair within a defined encryption or signature scheme. A public key can be shared; a private key must remain protected. These are different trust and distribution models, not interchangeable dropdown choices.

Comparing AES-256 with an RSA modulus using the same numeric bit count is misleading. Key sizes refer to different mathematical constructions. Choose a reviewed protocol and supported parameters rather than matching numbers.

Why systems combine them

A hybrid system can encrypt a message with a random symmetric key and protect that key using an asymmetric mechanism. This avoids trying to encrypt arbitrary large files directly with a public-key primitive. Real protocols must also define authentication, padding, metadata and key validation.

The AES website performs symmetric encryption only. It does not accept an RSA public key, create a hybrid envelope or verify an RSA signature. The file package uses a password-derived AES-GCM key, not RSA-wrapped key material.

Encryption is not a signature

A signature addresses a different task from confidentiality. AES-GCM authenticates a message under a shared secret, but everyone holding that secret can produce valid authenticated messages. A public-key signature has different verification and trust rules. Neither operation automatically establishes a human identity without a trusted way to obtain the relevant key.

Do not paste a PEM certificate into the raw AES key field. A PEM document is a structured object, not 16, 24 or 32 raw AES key bytes. A byte-length error is the appropriate outcome, not a reason to cut the PEM string shorter.

Choose a workflow you can recover

Use this site's password package for a local, versioned symmetric workflow. If your application requires recipient public keys, use a mature implementation of its established envelope format. Test recovery, protect keys separately and document who can decrypt. There is no RSA feature or key-conversion promise hidden behind this comparison guide.

Technical references

Updated October 16, 2026

Frequently asked questions

Can the AES key generator create an RSA key pair?

No. It creates 16/24/32 random AES key bytes, not RSA primes, public keys or private-key documents.

Can AES decrypt data encrypted with RSA?

No. Algorithms and envelopes must match. A hybrid format may contain an AES-encrypted payload, but its key-wrapping step must be handled by the corresponding implementation.