= Security Levels

Version: 1.0.0.5

== S0

Intended access: Public

Encryption: None

Signing: Optional

== S1

Intended access: Authorised users of S1 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

* AES
* ChaCha20*
* Twofish

== S2

Intended access: Authorised users of S2 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

* AES
* ChaCha20*
* Twofish

== S3

Intended access: Authorised users of s3 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

* AES
* ChaCha20*

== S4

Intended access: Authorised users of s4 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

* AES
* ChaCha20*

*Preferred when hardware-accelerated AES is unavailable.