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authorTim Ruffing <crypto@timruffing.de>2024-06-13 20:54:57 +0200
committerGitHub <noreply@github.com>2024-06-13 20:54:57 +0200
commit6a7af366a507192d6801b0fe5f507ecf2c34b242 (patch)
tree47fced6f2b1056503d46b4231facd6cf95108050 /bip-0327.mediawiki
parent85cda4e225b4d5fd7aff403f69d827f23f6afbbc (diff)
bip-0327: Remove obsolete paragraph
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1 files changed, 0 insertions, 3 deletions
diff --git a/bip-0327.mediawiki b/bip-0327.mediawiki
index 181926b..b659629 100644
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@@ -190,9 +190,6 @@ The aggregate public key can be ''tweaked'', which modifies the key as defined i
In order to apply a tweak, the KeyAgg Context output by ''KeyAgg'' is provided to the ''ApplyTweak'' algorithm with the ''is_xonly_t'' argument set to false for plain tweaking and true for X-only tweaking.
The resulting KeyAgg Context can be used to apply another tweak with ''ApplyTweak'' or obtain the aggregate public key with ''GetXonlyPubkey'' or ''GetPlainPubkey''.
-In addition to individual public keys, the ''KeyAgg'' algorithm accepts tweaks, which modify the aggregate public key as defined in the [[#tweaking-definition|Tweaking Definition]] subsection.
-For example, if ''KeyAgg'' is run with ''v = 2'', ''is_xonly_t<sub>1</sub> = false'', ''is_xonly_t<sub>2</sub> = true'', then the aggregate key is first plain tweaked with ''tweak<sub>1</sub>'' and then X-only tweaked with ''tweak<sub>2</sub>''.
-
The purpose of supporting tweaking is to ensure compatibility with existing uses of tweaking, i.e., that the result of signing is a valid signature for the tweaked public key.
The MuSig2 algorithms take arbitrary tweaks as input but accepting arbitrary tweaks may negatively affect the security of the scheme.<ref>It is an open question whether allowing arbitrary tweaks from an adversary affects the unforgeability of MuSig2.</ref>
Instead, signers should obtain the tweaks according to other specifications.