doc/security/security_levels.adoc

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= 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.