![]() ![]() ![]() Likewise, users should be required to enter a password to generate an encryption key that is never stored locally. Security teams can also scan systems - particularly local configuration files - for exposed plaintext passwords and encrypt the files. Signal recommends using full disk encryption to mitigate this type of attack. In addition to Windows and Mac, the program can also be downloaded on Linux, Fedora, Debian, Ubuntu and FreeBSD devices. The attacker is then prompted to enter an encryption key.Īn attacker with local access to the system could access the encryption key from the config.json file. To begin the attack, an attacker can use a SQL Database Browser program to open the database here: ~/Library/Application Support/Signal/config.json. While this exposes data at rest on the system, Signal has stated that it never intended to provide encryption at rest and that users can use full disk encryption if they want to protect data at rest on their systems.Įach time the Signal Desktop application opens the database, it stores the encryption key in plaintext to a local configuration file. ![]() This makes it possible for an attacker to easily gain access to encrypted messages without authentication as long as the attacker has local access to the system. The Signal Desktop application automatically generates encryption keys for the databases it uses, but the encryption key used to protect the database of encryption keys is, itself, stored in plaintext. ![]() Signal Desktop uses a SQLite database to store user messages, but the way the application encrypts those locally stored messages can expose decryption keys that are stored in plaintext. ![]()
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