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# Cryptographic Primitives
Reticulum uses a simple suite of efficient, strong and modern cryptographic primitives, with widely available implementations that can be used both on general-purpose CPUs and on microcontrollers. The necessary primitives are:
Reticulum uses a simple suite of efficient, strong and well-tested cryptographic primitives, with widely available implementations that can be used both on general-purpose CPUs and on microcontrollers.
One of the primary considerations for choosing this particular set of primitives is that they can be implemented *safely* with relatively few pitfalls, on practically all current computing platforms.
The primitives listed here **are authoritative**. Anything claiming to be Reticulum, but not using these exact primitives **is not** Reticulum, and possibly an intentionally compromised or weakened clone. The utilised primitives are:
- Ed25519 for signatures
- X22519 for ECDH key exchanges
- HKDF for key derivation
- AES-128 in CBC mode
- AES-256 in CBC mode
- HMAC-SHA256 for message authentication
- SHA-256
- SHA-512