"Fossies" - the Fresh Open Source Software Archive
Member "apg-2.2.3/doc/rfc0972.txt" (7 Aug 2003, 3776 Bytes) of package /linux/privat/old/apg-2.2.3.tar.gz:
As a special service "Fossies" has tried to format the requested text file into HTML format (style: standard
) with prefixed line numbers.
Alternatively you can here view
the uninterpreted source code file.
3 Network Working Group F. Wancho
4 Request for Comments: 972 WSMR
5 January 1986
7 Password Generator Protocol
10 STATUS OF THIS MEMO
12 This RFC specifies a standard for the ARPA Internet community. Hosts
13 on the ARPA Internet that choose to implement a Password Generator
14 Protocol (PWDGEN) are expected to adopt and implement this standard.
15 Distribution of this memo is unlimited.
19 Many security-conscious host administrators are becoming increasingly
20 aware that user-selected login passwords are too easy to guess for
21 even casual penetration attempts. Some sites have implemented
22 dictionary lookup techniques in their password programs to prevent
23 ordinary words from being used. Others have implemented some variant
24 of a randomly generated password with mixed success. The problem
25 arises from the fact that such passwords are difficult to remember
26 because they cannot be pronounced or are based on a relatively short
27 cycle pseudo-random number generator.
29 A version of the PWDGEN algorithm briefly described below has been in
30 use for several years at a small number of sites in the Internet.
31 Interest has recently been expressed at porting this algorithm to
32 other sites. However, the relatively short cycle and the resulting
33 randomness of the pseudo-random number generator available on these
34 sites tends to interfere with the intended result of minimizing the
35 potential duplication of passwords both within a site and across
36 sites when a user has access to more than one site.
38 The PWDGEN Service described herein provides a means for sites to
39 offer a list of possible passwords for the user to choose one from
40 the first set, or optionally select from another set. With more than
41 one site offering this service, it is then possible to randomly
42 select which site to use and have multiple fallback sites should that
43 site be unavailable.
47 The PWDGEN Service provides a set of six randomly generated
48 eight-character CRLF-delimited "words" with a reasonable level of
49 pronounceability, using a multi-level algorithm. An
50 implementation of the algorithm is available in FORTRAN-77 for
51 examination and possible implementation by system administrators
56 Wancho [Page 1]
60 RFC 972 January 1986
61 Password Generator Protocol
64 The uniqueness of the generated words is highly dependent on the
65 randomness of the initial seed value used. The availability of a
66 single system-wide seed, updated after each access is highly
67 desireable. Seeds based on a time-of-day clock are unacceptable.
68 Seed values should be stored as values in excess of 32 bits for
69 best performance.
71 TCP Based PWDGEN Service
73 One PWDGEN service is defined as a connection based application on
74 TCP. A server listens for TCP connections on TCP port 129. Once
75 a connection is established, the six CRLF-delimited words are
76 generated and sent to the caller, and the connection is closed by
77 the server. No dialog is used or required.
79 UDP Based PWDGEN Service
81 Another possible PWDGEN service is defined as a datagram based
82 application on UDP. A server listens for UDP datagrams on UDP
83 port 129. When a datagram is received, the six CRLF-delimited
84 words are sent back in an answering datagram.
113 Wancho [Page 2]