Update security policy (rust-lang#1133)

.github/SECURITY.md

@@ -0,0 +1,6 @@
+If you think you have discovered a security issue related to Kani, **please write to us**  at [email protected]; do **NOT** open a public issue. Along with your notification email, please provide any supporting material (proof-of-concept code, tool output, etc.) that would be useful in helping us understand the nature and severity of the security concern. Sensitive information can be encrypted using our [PGP key](https://github.com/model-checking/kani/blob/main/kani-verifier-security.public.key).
+
+We will send a non-automated acknowledgement email reply within 1 business day followed by an initial assessment of the issue within 5 business days. Subsequently, we will work in partnership with you to assess any impact of the issue and prepare a security advisory (including any patches with appropriate fix) as needed.
+
+If we confirm that your report represents a security issue in Kani, we will work with you to agree on an embargo period (typically at least 2 weeks AFTER any necessary development time) which will provide enough time to test our proposed fix and develop patches prior to any broader or more public disclosure. At the end of the embargo period, Kani maintainers will publicly release information about the security issue together with the patches that mitigate it.
+

kani-verifier-security.public.key

@@ -0,0 +1,31 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v2.0.22 (GNU/Linux)
+
+mQENBGJgjSQBCADGxrzSgt15n9FOOeQeYDhYRQPzF7haV4Pav71x0z9O1y2IlWVZ
+x+IVT0biyXPQXiR0kOUpSkJhOg+KUm9QzS8TReSxp40RglYpLxZYt6jFUOdZuJPV
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+dqYAYSfLsa4l9/jj45MmnuUHhvNqkUrqs5ahABEBAAG0Nkthbmkgc2VjdXJpdHkg
+dGVhbSA8a2FuaS12ZXJpZmllci1zZWN1cml0eUBhbWF6b24uY29tPokBOQQTAQIA
+IwUCYmCNJAIbAwcLCQgHAwIBBhUIAgkKCwQWAgMBAh4BAheAAAoJEKF/cGVJsPsV
+vxUIAMa9IthQF3fGR5iQHLQgBwQXtSYuVe0yD0IA0tIuwYUo1YLO31ApxzAocXI2
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++ti3BArQPhEZ0NhbTQVPD2zKKq45N5AF1r4ke4lfb7DYNkMEn9xJ9wnj/xeYYlHU
+ZhZ3Ac5Y6Z8QbS6f77I65xn4Ui2OftA55JjTlD+IsmqQO+AVhcKfiD5jgAgFLYCI
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+bFaxLyME+Et+1YvY/Br63PREAT4g9i9jAMyasp6VHx/MQrVtBHHJRvMSlFleFd0A
+EQEAAYkBHwQYAQIACQUCYmCNJAIbDAAKCRChf3BlSbD7Fap3CACO1h7eTAsLtsP2
+ImzCkN8QJ0HjP/Pu66fgM3rRfxl6aoaeeu95sBf8V4WxjoqKOmwNGOe0obRKghAP
+AXh4hwOri+1nr1JXKM2lXmbHP9GGYBtNvvLbWyDTBL50dZM74aAFNHLBHIIHL17U
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+ZNMVg/ClLAJ456B2VAxbdaJK9RjY9aq3GapOb0Gshi1+48w/Lq2GHbgb3167VOFg
+IOan2z2NfbCfasituHMyxTqgTawUR5hu2pV9l7w/Upiepp2TWbhzhgqPmrRMAn3s
+YmMgsyBY
+=kphk
+-----END PGP PUBLIC KEY BLOCK-----

scripts/ci/copyright-exclude

@@ -1,16 +1,17 @@
 .clang-format
 .diff
 .md
+.png
 .props
-expected
-ignore
+.public.key
+Cargo.lock
+LICENSE-APACHE
+LICENSE-MIT
 editorconfig
-gitignore
+expected
 gitattributes
+gitignore
 gitmodules
-LICENSE-APACHE
-LICENSE-MIT
-Cargo.lock
-.png
+ignore
 scripts/ci/copyright-exclude
 tools/make-kani-release/license-notes.txt