Cameron Miranda
Encryption is a hotly debated topic, with law enforcement agencies and security professionals at odds over the use of full-disk encryption. While law enforcement agencies have been known to pressure companies to create lawful access solutions, particularly for smartphones, vendors such as Apple have publicly denied creating backdoors for them. Modern encryption is robust, but users are often the weakest link, falling prey to malware, side-channel attacks, and other methods employed by law enforcement to gain access to encrypted devices. Although brute-forcing a complex encryption key is impractical, law enforcement may employ alternative tactics, such as seizing equipment while it is running or exploiting vulnerabilities, to circumvent encryption.
| Characteristics | Values |
|---|---|
| Law enforcement accessing encrypted data | Law enforcement agencies can gain access to encrypted data by leveraging vulnerabilities, known as "zero days", which may be unknown to the public or device manufacturer. They can also use malware, hardware interference, or side-channel attacks such as EM interference or acoustic attacks. |
| Court orders and passwords | A court order can compel an individual to provide their password to law enforcement. If an individual does not comply, they may be jailed. |
| Bypassing encryption | Law enforcement may pressure companies to create "lawful access" solutions or backdoors, especially in smartphones. They may also access data through cloud company backups, which can sidestep device encryption. |
| Brute-forcing encryption | Brute-forcing a conventional 128-bit encryption key is impractical with current technology. However, quantum computers can significantly reduce the time required to brute-force conventional encryption. |
| Device seizure | Law enforcement may seize equipment while it is running and image the RAM to possibly scrape the encryption key. They may also use techniques like "mouse wigglers" to prevent screen savers from activating while waiting for forensic access. |
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What You'll Learn
Law enforcement's use of malware and hardware interference
Law enforcement agencies have struggled with criminals using end-to-end encryption, which hampers the attribution and prosecution of offenders. While encryption is essential for privacy and cybersecurity, law enforcement has argued that it should not come at the cost of impeding their investigations.
Law enforcement agencies have a variety of methods to gain access to encrypted devices. One of the simplest ways is to seize devices while they are in an "unlocked" state, allowing them to bypass the need for encryption keys or passwords. They can also search physical locations to find written passwords or unencrypted copies of data. Additionally, they can employ surveillance techniques to capture passwords or encryption keys as they are entered.
In some cases, law enforcement may use malware to access encrypted information. With the permission of a magistrate, they may install key logger malware on a smartphone, which can report the passcode without the owner's knowledge. Another method involves tricking suspects into downloading malware or leaving infected USB keys in strategic locations.
Hardware interference is another tactic used by law enforcement. This includes exploiting side channels, such as electromagnetic (EM) interference or acoustic attacks, to retrieve passwords or encryption keys. Wireless keyboards and similar devices are often vulnerable to these types of attacks. Law enforcement may also leverage vulnerabilities, known as "zero days," to bypass encryption. These vulnerabilities may be unknown to the device manufacturer or the general public. For example, a hack presented at the Chaos Computer Club conference showed how it might be possible to bypass BitLocker encryption on a Windows 11 system by exploiting a Windows vulnerability.
Law enforcement agencies have pressured tech companies to create "lawful access" solutions, particularly for smartphones. Cloud companies' cooperation can also help access data without needing to break device encryption. However, companies like Apple have publicly stated that they do not create backdoors for law enforcement, despite speculation and requests from law enforcement agencies. The security community has argued against backdoors due to the security risks they pose, which could be exploited by criminal hackers.
While law enforcement has various methods to access encrypted information, modern encryption remains robust. Brute-forcing an encryption key is impractical, and tech companies cannot provide law enforcement with access to end-to-end encrypted communications without compromising users' privacy.
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Lawful access solutions and backdoors
Law enforcement agencies have long pressured companies to create "lawful access" solutions, particularly for smartphones. Lawful access is designed to balance an individual's right to privacy with the need for lawful access. Tech companies are in the best position to design and implement solutions that maximize security and privacy while ensuring lawful access. However, the security community has argued against law enforcement backdoors, as they create security weaknesses that criminal hackers might exploit.
In 2020, several US senators introduced the Lawful Access to Encrypted Data Act (LAEDA), a bill designed to strengthen national security interests and protect communities by ending the use of "warrant-proof" encrypted technology by terrorists and other criminals. The bill would require service providers and device manufacturers to assist law enforcement in accessing encrypted data after a court has issued a warrant based on probable cause that a crime has occurred. This would effectively require technology companies to provide a backdoor to their secure devices and systems.
Law enforcement agencies have expressed concern over Apple's end-to-end encryption protections for iCloud, arguing that warrant-proof encryption compromises their ability to protect the global public. Apple has publicly stated that it does not create backdoors for law enforcement, but there is much speculation around this, and many vendors have been caught with backdoors or security weaknesses in their systems.
Law enforcement may also gain access to encrypted data by exploiting vulnerabilities, which may be unknown to the general public or even the device manufacturer. For example, a hack demonstrated at the Chaos Computer Club conference showed how it might be possible to bypass BitLocker encryption on a fully up-to-date Windows 11 system. Other methods include tricking a suspect into downloading malware or exploiting side channels such as EM interference or acoustic attacks.
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Border crossings and data extraction
Border crossings are a particular concern for individuals and businesses when it comes to data security. In some countries, such as China, border agents may use specialised equipment to extract data from devices, even if they are locked or encrypted. This is a significant risk for workers travelling overseas, who may be required to decrypt their devices and present their contents at border crossings.
To protect their data, individuals may choose to shut down their devices or perform a factory reset before crossing a border. Some travellers opt to bring a spare device that has been wiped of all data, and then load a cloud backup once they are safely in their destination country.
In certain jurisdictions, customs agents have the power to compel device passwords without violating constitutional protections. For example, in Canada, several provisions in the Customs Act require persons entering the country to truthfully answer agents' questions, including requests for device passwords.
Law enforcement agencies have a range of methods to gain access to encrypted devices. The simplest approach is to seize devices while they are in an "unlocked" state. They may also search physical locations for written passwords or unencrypted copies of data, or use surveillance techniques to capture passwords or encryption keys as they are entered. When a device is seized, law enforcement can request the PIN, password, or biometric data from the suspect to access the device if they believe it contains relevant evidence.
If access is not gained, law enforcement may use forensic tools and software to unlock, decrypt, and extract data from a mobile phone or computer. In some cases, they may turn to outside firms that specialise in bypassing locks and accessing and copying encrypted data. However, the use of these tools and third-party vendors has raised concerns about the potential for overreach and violations of constitutional protections.
The increasing sophistication of smartphone security measures, including the use of thumbprints, face recognition, and advanced encryption, has created challenges for law enforcement. The phenomenon of ""warrant-proof" encryption, where only the end user can decrypt the data, has made it difficult for law enforcement to obtain electronic evidence, even with a warrant or court order. This has been a particular issue in cases involving child exploitation, sex trafficking, and other serious crimes.
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Court orders and data protection
The term "lawful access" refers to law enforcement's ability to obtain evidence and threat information from digital service providers and device manufacturers through court-authorized processes. However, the increasing use of warrant-proof encryption by service providers and manufacturers has significantly hindered law enforcement's ability to access digital evidence, even with a warrant or court order. This situation has created what law enforcement describes as a ""lawless space", where criminals and other malicious actors can operate with impunity.
In the United States, the Fifth Amendment protects individuals from being forced to incriminate themselves, including forfeiting a password. Nevertheless, individuals have been held in contempt of court and faced severe consequences for refusing to comply with court orders to provide encryption keys or passwords. This complex legal landscape has led to discussions and debates among law enforcement, legal professionals, and the public.
To address these challenges, law enforcement agencies, such as the FBI, advocate for the use of responsibly managed encryption. They support strong encryption that protects privacy while also allowing authorized access by law enforcement when presented with a legal court order. This approach aims to balance the need for privacy and security while ensuring that law enforcement can effectively investigate crimes and protect the public.
The deployment of warrant-proof encryption by service providers and device manufacturers has significant implications for court orders and data protection. While it enhances privacy and security for users, it also creates obstacles for law enforcement, potentially impacting their ability to investigate crimes, protect victims, and ensure public safety. As technology continues to evolve, the interplay between court orders, data protection, and encryption will remain a critical and dynamic area of focus for legal systems worldwide.
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The use of brute force
Brute-force attacks involve systematically checking all possible key combinations until the correct key is found. This method is very fast when used to check all short passwords, but for longer passwords, other methods are used because a brute-force search takes too long. Longer passwords, passphrases, and keys have more possible values, making them exponentially more difficult to crack than shorter ones due to the diversity of characters.
The resources required for a brute-force attack grow exponentially with increasing key size, not linearly. There is a physical argument that a 128-bit symmetric key is computationally secure against brute-force attack. The amount of energy required to brute force a 128-bit key is ridiculously large, requiring all the world's resources for 10 years straight, just for cracking one key.
Even with a supercomputer, it would take 1 billion billion years to crack the 128-bit AES key using a brute-force attack. This is more than the age of the universe (13.75 billion years). If one were to assume that a computing system existed that could recover a DES key in a second, it would still take that same machine approximately 149 trillion years to crack a 128-bit AES key.
However, there are no good theoretical limits to prevent humanity from eventually brute-forcing a 128-bit key. The use of brute force to crack 128-bit encryption is not limited to theoretical discussions, and there are practical considerations as well. For example, law enforcement agencies may attempt to crack encrypted hard drives if they have a court order. In such cases, the user may be legally required to provide the password. However, it is important to note that there are many other ways to access data that are much easier than cracking the encryption. The incentive to break the encryption depends on the value of the data.
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Frequently asked questions
Modern encryption is quite robust, but law enforcement can gain access to encrypted devices in several ways. However, it is unclear if they can crack 128-bit encryption.
Law enforcement can use various methods to gain access to encrypted devices, including:
- Malware attacks, such as tricking a suspect into downloading malware or leaving an infected USB drive for them to use.
- Exploiting side channels like EM interference or acoustic attacks to retrieve a machine's password.
- Using specialised equipment to extract data from devices, even if they are locked or encrypted.
- Seizing a suspect's equipment while it is running and imaging the RAM to possibly scrape the encryption key.
- Gaining access to cloud backups, which can sidestep the need to break the encryption of a device.
- Leveraging vulnerabilities in the encryption, often referred to as "zero days," which may be unknown to the device manufacturer or the public.
Individuals can take several steps to protect their data from law enforcement, including:
- Using full disk encryption, which is much harder for law enforcement to crack than depicted in movies and TV shows.
- Employing a deniable encryption system like TrueCrypt, which allows for a hidden container with a decoy password to be used in case the individual is forced to give up their password.
- Using a long and complex password or passphrase, as these are more difficult to brute force.
