Smb2NegotiateResponse resp = (Smb2NegotiateResponse) this.negotiated;
        int cipherId = -1;

        if ( resp.getSelectedDialect().atLeast(DialectVersion.SMB311) ) {
            cipherId = resp.getSelectedCipher();
        }
        else if ( resp.getSelectedDialect().atLeast(DialectVersion.SMB300) ) {
            cipherId = EncryptionNegotiateContext.CIPHER_AES128_CCM;
        }
        else {

            log.debug("Secure negotiation does not apply");
            return;
        }

        Smb2NegotiateResponse nego = (Smb2NegotiateResponse) trans.getNegotiateResponse();
        if ( nego.getSelectedDialect().atLeast(DialectVersion.SMB311) ) {
            // have preauth integrity instead
            log.debug("Secure negotiation does not apply, is SMB3.1");
            return;
        }