Security Levels

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):

1. AES
2. ChaCha20*
3. Twofish

S2

Intended access: Authorised users of S2 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

1. AES
2. ChaCha20*
3. Twofish

S3

Intended access: Authorised users of s3 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

1. AES
2. ChaCha20*

S4

Intended access: Authorised users of s4 or lower security levels

Encryption: Enforced

Signing: Enforced

Permitted symmetrical encryption ciphers (order of preference):

1. AES
2. ChaCha20*

*Preferred when hardware-accelerated AES is unavailable.