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--- pgpfan:tpp [2023/02/10 17:21] – Secret not needed for encryption in PK system. b.walzer
+++ pgpfan:tpp [2023/12/19 13:21] (current) – How unlikely? b.walzer
@@ Line 111: / Line 111: @@
 >Even if you do, the new SEIP packet format is close enough to the insecure SE format that you can potentially trick readers into downgrading; ...
-We have a problem here. The juxtaposition of the non sequitur about chopping off the last 22 bytes makes it seem that that is all that is required to downgrade the MDC. Some digging reveals that this is actually quite difficult and has a very low chance of success((Discussion:[[https://github.com/google/end-to-end/issues/161|No warning on decrypting Tag 9 (no integrity protection) packets]], Exploit code:[[https://gist.github.com/coruus/85dea6eb82897044f65d]])). We can be charitable here and assume that the author simply did not do any research but this is very misleading.
+We have a problem here. The juxtaposition of the non sequitur about chopping off the last 22 bytes makes it seem that that is all that is required to downgrade the MDC. Some digging reveals that this is actually quite difficult and has a very low chance of success(1 out of 32768)((Discussion:[[https://github.com/google/end-to-end/issues/161|No warning on decrypting Tag 9 (no integrity protection) packets]], Exploit code:[[https://gist.github.com/coruus/85dea6eb82897044f65d]])). We can be charitable here and assume that the author simply did not do any research but this is very misleading.
 >Trevor Perrin worked the SEIP out to 16 whole bits of security.