The world has seen a massive uptick in mobile messaging over the past decade with SMS, or short message service, being the go-to messaging service for a long time. However, with advancements in technology, industry giants like Google and Apple have implemented Rich Communication Service Message, which offers advanced features over SMS. But, with these new features comes the question of security. Is RCS really safer than SMS?

Understanding RCS and SMS

Before we dive into the security features of RCS and SMS, let’s briefly examine what each of these messaging systems involves.

What is RCS?

Rich Communication Services (RCS) is a next-generation rich text messaging service protocol that offers advanced features to users. These features include real-time chat, high-quality multimedia sharing, and advanced group messaging. RCS is an upgrade to traditional SMS, which is why it’s also referred to as “SMS+” or “Advanced Messaging.”

RCS business messaging is a game-changer in the world of messaging. It allows users to send and receive rich messaging service, such as high-quality images, videos, and audio files. Additionally, RCS allows users to see when their messages have been delivered and read, and it even enables real-time chat, much like popular messaging apps such as WhatsApp and Facebook Messenger.

One of the most significant advantages of RCS is its ability to support advanced group messaging. With RCS, users can create groups and add or remove members as they please. They can also name their groups and assign group icons, making it easier to identify conversations and keep track of different groups.

What is SMS?

On the other hand, Short Message Service (SMS) is a basic messaging service that allows sending and receiving text messages of up to 160 characters. Although it’s a simple messaging service, it’s still the most widely used messaging protocol worldwide.

SMS has been around for decades, and it’s still a popular way to communicate, especially in areas where internet connectivity is limited. SMS is reliable and easy to use, and it doesn’t require an internet connection to work. This makes it an ideal messaging protocol for people who don’t have access to the internet or who prefer not to use messaging apps.

However, SMS does have some limitations. For example, it doesn’t support rich media, such as images or videos, and it doesn’t offer read receipts or real-time chat. Additionally, SMS group messaging is limited, and users can’t name their groups or assign group icons.

Despite these limitations, SMS remains a popular messaging protocol, and it’s still widely used around the world. It’s a reliable and straightforward way to communicate, and it’s accessible to almost everyone with a mobile phone.

Overall, RCS and SMS are two very different messaging protocols with their own unique advantages and limitations. While RCS offers advanced features and rich media messaging support, SMS is a basic messaging service that’s still widely used around the world. Both messaging protocols have their place in the world of communication, and it’s up to individual users to decide which one is best for their needs.

Comparing RCS and SMS Security Features

When it comes to security, RCS and SMS have similarities and differences that are worth highlighting. While both messaging platforms offer encryption and authentication, there are some key differences between the two that users should be aware of.

Encryption in RCS and SMS

Encryption plays an essential role in secure messaging. Both RCS and SMS feature encryption; however, with RCS, it’s end-to-end (E2E) encryption that’s considered the gold standard in messaging security. End-to-end encryption means that only the sender and recipient can read the messages exchanged, even if someone were to intercept them. This is because the messages are encrypted on the sender’s device and decrypted only on the recipient’s device.

While SMS also has encryption, it’s not always E2E. SMS relies on mobile networks to provide communication channels, which are encrypted to some extent. But network-level encryption doesn’t protect your message privacy from mobile carriers or hackers. This means that SMS messages can potentially be intercepted and read by unauthorized parties, making them less secure than RCS messaging services.

Authentication and Identity Verification

When it comes to RCS and SMS security, another important consideration is authentication and identity verification. In RCS API, this is achieved through advanced encryption methods and digital certificates. Digital certificates help verify the identity of the sender and recipient, so it’s hard for fraudsters to pass off as someone else. This is because digital certificates are issued by trusted authorities and are difficult to forge.

With SMS, authentication and identity verification are done through SMS center servers, which can be vulnerable to hacking attacks. This means that SMS messages can potentially be spoofed, allowing fraudsters to impersonate someone else and send messages on their behalf. This is a serious security concern, especially in industries such as finance and healthcare where sensitive information is often exchanged via SMS.

Overall, while both RCS and SMS offer some level of security, RCS is generally considered to be more secure due to its use of end-to-end encryption and digital certificates for authentication and identity verification. However, it’s important to note that no messaging platform is 100% secure, and users should always take precautions to protect their privacy and sensitive information.

Potential Vulnerabilities in RCS and SMS

Despite the security features in RCS and SMS, no messaging system is completely secure. Each system has its potential vulnerabilities that hackers can exploit to steal personal data or engage in phishing attacks.

Known RCS Security Flaws

In 2021, several RCS vulnerabilities were discovered, which hackers could use to exploit users. One of the vulnerabilities discovered was an RCS messaging flaw that enabled hackers to access a user’s device by sending a malicious file through Multimedia Messaging Service (MMS). This enabled the attacker to take control of the recipient’s device.

Known SMS Security Flaws

SMS has been around for a long time, and as a result of its age, it has been the target of many attacks. One of the well-known SMS vulnerabilities is “smishing,” where attackers send malicious links or texts to a user’s device. When clicked, the link or text installs malware on the device or steals confidential data.

Real-World Security Incidents

Over the years, both RCS and SMS have experienced security incidents that affected users globally. These incidents have highlighted the importance of secure communication platforms in today’s digital age.

RCS Security Breaches

One of the well-known RCS security breaches was the 2020 takedown of two global hacking groups GhostSec and VendettaWorldWide who used RCS platforms to distribute malware that stole banking credentials. The malware was designed to intercept SMS messages and steal sensitive information, including credit card numbers, bank account details, and login credentials.

According to reports, the hackers used social engineering tactics to trick users into downloading the malicious software. Once the malware was installed on the victim’s device, it would give the hackers complete access to the device, allowing them to steal sensitive information without the user’s knowledge.

Fortunately, the security breach was detected and the hackers were apprehended before they could cause any further damage. However, the incident served as a reminder of the importance of using secure communication platforms and being vigilant against social engineering attacks.

SMS Security Breaches

In 2019, an SMS messaging breach compromised 90 million users globally. SIM card provider Supra Telecom stored more than 26 million text messages sent between its subscribers and stored the data in an unsecured database in Brazil. The breach was discovered by security researchers who found that anyone with an internet connection could access the database without a password or any other form of authentication.

The breach exposed sensitive information, including phone numbers, names, and text messages, which could be used by cybercriminals for identity theft, fraud, and other malicious activities. The incident highlighted the importance of secure data storage and the need for companies to implement robust security measures to protect their users’ data.

Following the breach, Supra Telecom issued a statement acknowledging the incident and assuring its users that it had taken steps to secure its database. The incident served as a wake-up call for companies to prioritize data security and implement best practices to protect their users’ sensitive information.

Best Practices for Secure Messaging

While no messaging system is entirely immune to attacks, implementing best practices can minimize the risks. Here are some additional tips to help keep your messages secure:

Protecting Your Privacy with RCS

If you’re using RCS, it’s best to verify that your messaging provider has implemented end-to-end encryption. This means that your messages will be encrypted as they leave your device and can only be decrypted by the intended recipient. Some messaging providers may claim to offer encryption, but it’s important to verify that it’s end-to-end encryption and not just encryption in transit. Enabling two-factor authentication can also help add an extra layer of security. This means that you’ll need to provide a second form of authentication, like a code sent to your phone, in addition to your password, to access your account.

Another way to protect your privacy with RCS is to be mindful of the information you share. While end-to-end encryption can protect the contents of your rich messaging, it can’t protect metadata like who you’re talking to or when you’re talking to them. If you’re concerned about your privacy, consider using a messaging app that doesn’t require you to provide a phone number or other identifying information.

Protecting Your Privacy with SMS

When it comes to SMS security, there are a few things to keep in mind. First, avoid clicking on links or downloading files sent from unknown numbers or dubious websites. These links or files could contain malware or phishing scams that could compromise your device or steal your personal information.

Also, as much as possible, avoid sending sensitive information like passwords or banking details over SMS. SMS messages are not encrypted, which means that anyone who intercepts them could potentially read their contents. If you need to send sensitive information, consider using a messaging app that offers end-to-end encryption.

Finally, be wary of SMS messages that ask you to provide personal information or login credentials. These could be phishing scams designed to trick you into giving away your information. If you’re not sure whether a message is legitimate, contact the company or organization directly to verify.


In terms of security, RCS is safer than SMS. RCS has advanced features like end-to-end encryption, identity verification, and digital signatures that make it harder for hackers to exploit. Even though SMS has some encryption, it doesn’t match RCS’s E2E encryption, making it vulnerable to attacks. However, while RCS has better security than SMS, no messaging system is completely secure. Implementing best practices and staying up-to-date with security updates can help secure your messaging experience regardless of the platform you use.

Also read: What Does RCS Chat Mean

Published on Jun 19, 2023