RFC 2947 (rfc2947) - Page 1 of 6
Telnet Encryption: DES3 64 bit Cipher Feedback
Alternative Format: Original Text Document
Network Working Group J. Altman
Request for Comments: 2947 Columbia University
Category: Standards Track September 2000
Telnet Encryption: DES3 64 bit Cipher Feedback
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. 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 Triple-DES (data encryption
standard) encryption algorithm in cipher feedback mode with the
telnet encryption option.
1. Command Names and Codes
Encryption Type
DES3_CFB64 3
Suboption Commands
CFB64_IV 1
CFB64_IV_OK 2
CFB64_IV_BAD 3
2. Command Meanings
IAC SB ENCRYPT IS DES3_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.
Altman Standards Track
