# SSH([Setup] Menu)

## "TTSSH: Setup" Dialog box

Preferred cipher order
  Specify the type of encryption for SSH with the order.
  <ciphers below this line are disabled>

  aes256-gcm@openssh.com | not RFC5647, PROTOCOL of OpenSSH
  aes128-gcm@openssh.com | not RFC5647, PROTOCOL of OpenSSH
  camellia256-ctr | draft-kanno-secsh-camellia-02
  aes256-ctr | RFC4344
  camellia256-cbc | draft-kanno-secsh-camellia-02
  aes256-cbc | RFC4253
  camellia192-ctr | draft-kanno-secsh-camellia-02
  aes192-ctr | RFC4344
  camellia192-cbc | draft-kanno-secsh-camellia-02
  aes192-cbc | RFC4253
  camellia128-ctr | draft-kanno-secsh-camellia-02
  aes128-ctr | RFC4344
  camellia128-cbc | draft-kanno-secsh-camellia-02
  aes128-cbc | RFC4253
  3des-ctr | RFC4344
  3des-cbc | RFC4253
  blowfish-ctr | RFC4344
  blowfish-cbc | RFC4253
  cast128-ctr | RFC4344
  cast128-cbc | RFC4253
  3DES(SSH1) |
  arcfour256 | RFC4345
  arcfour128 | RFC4345
  arcfour | RFC4253
  Blowfish(SSH1) |
  DES(SSH1) |

SSH Known Hosts
  Specify the file which includes a name of Host connected via SSH (and Public key for Host).
Host key rotation

  Configure the host key rotation feature(OpenSSH 6.8 or later).

  SSH server has the host key, however the host key may be changed for any reason.
  In this case, SSH server sends a list of new host keys to client. Next, the server urges updating of host key lists to client.
  TTSSH can support this feature. When a list of new host key is received, the known hosts list of client is updated.

  No
    Do not update the known hosts file.
  Yes
    Automatically update the known hosts file.
  Ask
    A user is asked to confirm the modifications to the known hosts file.
HeartBeat (keep-alive)
  A Keep-alive packet is sent on a regular basis to maintain the connection (particularly useful under NAT). If 0 is specified, this feature is disabled.
Remember password in memory
  The user password is preserved in the memory. The password in the memory is used by "Duplicate session" function. The password is deleted in the memory when Tera Term session disconnects.
Enable agent forwarding
  The SSH agent forwarding is enabled using by the Pageant application.
Confirm agent forwarding
  When the SSH agent-forwarding is requested, a user will confirm contacting the Pageant.
Verify host key fingerprint by DNS
  The host key of the SSH server is verified by using the SSHFP Resource Record.
  The result of this verification should be used only as a guide.
KEX order (SSH2 only)
  Specify the type of KEX(Key Exchange) for SSH2 with the order.
  <KEXs below this line are disabled>

  ecdh-sha2-nistp256 | RFC5656
  ecdh-sha2-nistp384 | RFC5656
  ecdh-sha2-nistp521 | RFC5656
  diffie-hellman-group18-sha512 | RFC8268
  diffie-hellman-group16-sha512 | RFC8268
  diffie-hellman-group14-sha256 | RFC8268
  diffie-hellman-group-exchange-sha256 | RFC4419
  diffie-hellman-group-exchange-sha1 | RFC4419
  diffie-hellman-group14-sha1 | RFC4253
  diffie-hellman-group1-sha1 | RFC4253

MAC order (SSH2 only)
  Specify the type of MAC for SSH2 with the order.
  <MACs below this line are disabled>

  hmac-sha2-512 | RFC6668
  hmac-sha2-256 | RFC6668
  hmac-sha1 | RFC4253
  hmac-ripemd160@openssh.com |
  hmac-md5 | RFC4253
  hmac-sha1-96 | RFC4253
  hmac-md5-96 | RFC4253

Host key order (SSH2 only)
  Specify the type of host key for SSH2 with the order.
  <Host keys below this line are disabled>

  ecdsa-sha2-nistp256 | RFC5656
  ecdsa-sha2-nistp384 | RFC5656
  ecdsa-sha2-nistp521 | RFC5656
  ssh-ed25519 | draft-ietf-curdle-ssh-ed25519-02
  ssh-rsa | RFC4253
  ssh-dss | RFC4253

Compression order (SSH2 only)
  Specify the type of compression key for SSH2 with the order.
  <Compressions below this line are disabled>

  zlib@openssh.com | Delayed compression(Starts compressing after authentication)
  zlib |
  none | No compression

Compression level
  Specify the level of compression for transmission. The more right, the more compression is done (note: it may degrade the throughout with a high-speed link such as ADSL or FTTH).
  By using SSH1 protocol, when the Compression level is 0, the packet compression is disabled, or the Compression level is over 1, the compression is enabled.
  By using SSH2 protocol, use the Compression order to enable the packet compression. And then, set the Compression level to 1 over.
LogLevel
  Specify the debug level of TTSSH module.
  When the debug level is greater than 0, the debug data is recorded in "TTSSH.LOG",
  "ssh2connect.log" and "ssh2packet.log" under ttermpro.exe directory.

  Value | Meaning
  0 | Disabled
  5 | Fatal
  10 | Error
  30 | Warning
  50 | Notice
  80 | Information
  100 | Verbose
  200 | SSH Dump