Password Manager Encryption Downgrade Attack
Detects a potential attempt to downgrade a password manager client's encryption to a legacy, non-authenticated mode (e.g., AES-CBC). A malicious or compromised server can send a specially crafted response during login or synchronization that forces the client to use weaker cryptography. This can compromise the integrity and confidentiality of the user's vault, enabling further attacks like vault modification or padding oracles.
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