RFC2693 refers to it, including in the references:
[SEXP] Ron Rivest, code and description of S-expressions,
<http://theory.lcs.mit.edu/~rivest/sexp.html>.
and:
[SDSI] Ron Rivest and Butler Lampson, "SDSI - A Simple
Distributed Security Infrastructure [SDSI]",
<http://theory.lcs.mit.edu/~cis/sdsi.html>.
is also gone, my guess is that theory.lcs.mit.edu is no more.
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