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