Network Working Group T. Ts'o
Request for Comments: 2953 VA Linux Systems
Category: Informational September 2000
Telnet Encryption: DES 64 bit Output 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 data encryption standard (DES)
encryption algorithm in output feedback mode with the telnet
encryption option.
1. Command Names and Codes
Encryption Type
DES_OFB64 2
Suboption Commands
OFB64_IV 1
OFB64_IV_OK 2
OFB64_IV_BAD 3
2. Command Meanings
IAC SB ENCRYPT IS DES_OFB64 OFB64_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
OFB64_IV command. The initial vector is sent in clear text. Only
the side of the connection that is WILL ENCRYPT may send the
OFB64_IV command
IAC SB ENCRYPT REPLY DES_OFB64 OFB64_IV_OK IAC SE
IAC SB ENCRYPT REPLY DES_OFB64 OFB64_IV_BAD IAC SE
Ts'o Informational