Logitech Unifying devices allow live decryption if the pairing of a keyboard to a receiver is sniffed.
unifying_receiver_firmware
CVE-2019-13053
Logitech Unifying devices allow keystroke injection, bypassing encryption. The attacker must press a “magic” key combination while sniffing cryptographic data from a Radio Frequency transmission. NOTE: this issue exists because of an incomplete fix for CVE-2016-10761.