Vulnerabilities in Sogou Keyboard encryption expose keypresses to network eavesdropping.
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Literally says in bold even:
the keystrokes of Sogou Input Method users can be decrypted by a network eavesdropper, informing the eavesdropper of what users are typing as they type.
AKA every keystroke
I assume they mean “if suitable suggestions are not available in the input method’s local database”. Like you start typing a word, and when it doesn’t find any match locally, it goes to the server. After that, any additional keystroke gets reported to the server “as they type”.