Message encryption keys are only shared with devices that have been cross-signed by their owner. Encryption will throw an error if a verified user replaces their identity. Events are decrypted only if they come from a cross-signed device other events will result in a decryption failure. (To access the failure reason, see MatrixEvent.decryptionFailureReason.)
Message encryption keys are shared with all devices in the room, except for
blacklisted devices, or unverified devices if
globalBlacklistUnverifiedDevices is set. Events from all senders are
decrypted.
Events are encrypted as with Legacy mode, but encryption will throw an error if a
verified user has an unsigned device, or if a verified user replaces
their identity. Events are decrypted only if they come from cross-signed
devices, or devices that existed before the Rust crypto SDK started
tracking device trust: other events will result in a decryption failure. (To access the failure
reason, see MatrixEvent.decryptionFailureReason.)
The cryptography mode. Affects how messages are encrypted and decrypted. Only supported by Rust crypto.