With more gadgets than ever before connected to the Internet and requiring a SIM card to access a Mobile Network Operator's (MNO) service, connection and mobility are critical in today's society. As a result, securing the security of eSIM and SIM cards has become a critical component in data and communication security.

SIM cards, or Subscriber Identity Modules, are important components that allow end devices to link to Mobile Network Operator services. Traditionally, they are a separate entity placed into a device. In contrast, eSIMs are inserted right into the device during the manufacturing process.

While the benefits of e SIM technology are already clear, it is critical to recognize the security problems in eSIM administration, with the overarching purpose of protecting sensitive subscriber data. One of the most important issues is software attacks. These attacks take different forms, with the most common being:

eSIM switching and cloning attacks

Attackers trick the MNO by seeking to replace a SIM card for an existing account. They can then use SMS and other services that the original SIM receives, typically for Multi-Factor Authentication, to gain access to various accounts and payment systems.

Memory depletion

Contacting the e-SIM profile and spamming it with irrelevant but huge profiles. The goal is for the device to finally be unable to contact the service provider and become disconnected from mobile networks.

Understanding Memory Attacks

A SIM card includes adjustable fields like the "remaining memory" field. With a specialized injection attack, this field can be set to zero. This confuses the eSIM into thinking there is no memory left, preventing new profiles from being added to the eSIM.

Inflated profile assaults

Adding too many profiles to an eSIM exceeds its memory capacity. With no more space available, it will be unable to add new profiles or change the network provider.

Locking profile attacks

A specific option in the profile locks the eSIM to a single communications provider. As a result, the gadget cannot switch networks and becomes worthless.

How to avoid any security issues

Cybercriminals employ these eSIM security flaws to interrupt services or obtain unauthorized access to critical data, posing a huge risk to subscribers, organizations, users, and mobile network providers.

This is assured using cryptography. The AA cryptographic key is put into the eSIM card during the manufacturing process. Key injection is the first step towards safely injecting encryption keys to protect the cardholder's data. It is also used to handle an IoT device across its lifetime safely. To ensure that device identities are not compromised, keys must be created by a Hardware Security Module (HSM).

The key injection is one of two cryptographic approaches for ensuring safe authentication and information sharing in international eSIM environments. A Pre-Shared Key architecture relies on symmetric encryption, as only the concerned parties have access to the key and may thus build a secure connection using their commonly known secret.

A public key infrastructure uses asymmetric encryption algorithms. A key pair, which consists of a public and private key pair, is generated. Because these keys are cryptographically connected, they can be used to confirm each other's identity. The private key can be used to generate signatures that can be validated with the public key.