Network Working Group T. Ts'o
Request for Comments: 2952 VA Linux Systems
Category: Informational September 2000
Telnet Encryption: DES 64 bit Cipher Feedback
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This document specifies how to use the DES encryption algorithm in
cipher feedback mode with the telnet encryption option.
1. Command Names and Codes
Encryption Type
DES_CFB64 1
Suboption Commands
CFB64_IV 1
CFB64_IV_OK 2
CFB64_IV_BAD 3
2. Command Meanings
IAC SB ENCRYPT IS DES_CFB64 CFB64_IV IAC SE
The sender of this command generates a random 8 byte initial
vector, and sends it to the other side of the connection using the
CFB64_IV command. The initial vector is sent in clear text. Only
the side of the connection that is WILL ENCRYPT may send the
CFB64_IV command.
IAC SB ENCRYPT REPLY DES_CFB64 CFB64_IV_OK IAC SE
IAC SB ENCRYPT REPLY DES_CFB64 CFB64_IV_BAD IAC SE
T'so Informational