【计】 multilevel security proof
【计】 many stages; multiclass; multistep
safety; security; sureness
【经】 safety
prove; certify; argue; demonstrate; justify; manifest; testify; vouch
【计】 proofness; proving
【化】 proofing
【医】 certificate; certify; proof
【经】 attest; attestation; authenticated; authentication; certification
certify; testimony