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How AES, RSA, and ECC differ
| Family | Type | Typical roles | What to remember |
|---|---|---|---|
| AES | Symmetric block cipher | Encrypting and decrypting data | Both sides need the corresponding secret key. AES uses 128-bit blocks and has standardized key sizes of 128, 192, or 256 bits. NIST FIPS 197 |
| RSA | Public-key algorithm | Digital signatures; also appears in key-strength comparisons and encryption/key-transport guidance | Name the operation and scheme. RSA signing is not the same operation as RSA encryption or key establishment. NIST FIPS 186-5 announcement |
| ECC | Public-key cryptography family based on elliptic curves | Digital signatures and key establishment | Specify the scheme and operation, such as ECDSA or EdDSA for signatures, or an approved elliptic-curve key-agreement method. NIST SP 800-56A Rev. 3 |
What each one does
AES encrypts data with a shared secret
AES is symmetric: the communicating parties use the same secret key, or the corresponding shared secret, to encrypt and decrypt. Its three standardized key options are AES-128, AES-192, and AES-256; those numbers describe key length, not block size. All three operate on 128-bit blocks. NIST’s May 9, 2023 update to FIPS 197 modernized the document’s presentation and made no technical changes to AES. NIST FIPS 197
RSA supports public-key operations
RSA is a public-key algorithm, but saying only “RSA” does not identify what it is doing. NIST’s Digital Signature Standard includes RSA for generating and verifying digital signatures. RSA also appears in NIST strength comparisons and encryption guidance, but signing, encryption, and key establishment are distinct operations with different schemes and requirements. NIST’s FIPS 186-5 announcement
ECC is a family, not a single algorithm
Elliptic-curve cryptography (ECC) covers multiple schemes. NIST standards include ECDSA and EdDSA for digital signatures, as well as elliptic-curve methods for key establishment. A useful technical description therefore names the curve or scheme and the operation, rather than treating “ECC” as one generic encryption algorithm. NIST SP 800-186 and NIST SP 800-56A Rev. 3
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Why systems use them together
These families address different parts of a cryptographic system. A public-key scheme can support a signature that lets a recipient verify who signed a message, or a key-establishment process that lets parties arrive at shared key material. AES can then encrypt data using a shared secret key. The exact combination depends on the protocol, its approved schemes, and its interoperability and policy requirements; the broad labels alone do not specify a complete design.
How to compare key strength
Key lengths from different families cannot be compared bit for bit. NIST implementation guidance associated with FIPS 140-2 gives the following illustrative comparable-strength pairings:
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| Example strength pairing | Algorithms | Qualification |
|---|---|---|
| First example | AES-128; RSA 3072-bit; ECC 256-bit | NIST implementation-guidance example, not a speed or functional equivalence claim. FIPS 140-2 Implementation Guidance |
| Second example | AES-256; RSA 15,360-bit; ECC 512-bit | NIST implementation-guidance example, not a speed or functional equivalence claim. FIPS 140-2 Implementation Guidance |
These figures are examples of comparable security strength—not a universal performance ranking or configuration prescription. The cited table is in guidance associated with FIPS 140-2, so check its current applicability and the standards governing your system before choosing parameters.
Standards status and the quantum caveat
NIST’s standards provide important context, but a publication date or update notice should not be mistaken for a newly completed standard. FIPS 186-5 specifies RSA, ECDSA, and EdDSA techniques for digital signature generation and verification. SP 800-186 recommends elliptic curves for U.S. government use, and its publication page flags a potential issue in section 3.2.2.1 for correction in a future revision. FIPS 186-5 announcement; SP 800-186
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SP 800-56A Rev. 3, published April 16, 2018, covers discrete-logarithm key establishment over finite fields and elliptic curves, including DH and MQV variants. On January 6, 2026, NIST announced a decision to update Rev. 3 and revise SP 800-56C, with goals including alignment with SP 800-186 and approval of certain x-coordinate-only ECC key-agreement implementations. Those are announced goals, not evidence that a revised final publication has been issued. SP 800-56A Rev. 3; NIST’s January 6, 2026 notice
There is also a quantum-computing qualification. In its February 3, 2023 announcement about FIPS 186-5 and SP 800-186, NIST said the algorithms in those standards “are not expected to provide resistance to attacks from a large-scale quantum computer.” That statement applies to the algorithms in those named standards; it is not a claim about every cryptographic algorithm or every future system. NIST announcement
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How to choose for a real system
There is no one-size-fits-all winner among AES, RSA, and ECC. Start with the operation you need, then verify the standards and implementation constraints that apply to your system.
Quick Recap
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- For bulk data encryption: determine the required symmetric cipher and key-handling rules; AES is the symmetric option covered here.
- For signatures: select a specific supported signature scheme, such as RSA, ECDSA, or EdDSA where permitted, and confirm verifier interoperability.
- For key establishment: identify the approved key-agreement method, parameters, and protocol requirements rather than choosing based on the label “RSA” or “ECC.”
- For any deployment: check the required security strength, applicable policy, approved schemes and curves, library or device support, and interoperability needs.
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