A5.1 Decryptor

GSM Encryption

Cellphones have become an essential part of today’s world. Several standards have been propositioned for the mobile communication, and one of them is GSM. With the rise in cellphone-based crimes, it becomes necessary for Law Enforcement Agencies (LEAs) to have access to the information circulated in the form of voice or data from suspected targets. However, GSM uses various encryption algorithms such as A5.1, A5.2 and A5.3 which makes the task of the LEAs more difficult. Thus, if any LEA must intercept the GSM communications, A5.1 Decryptors would be required to decrypt the communications.

What is an A5.1 Decryptor and how does it work?


To decipher GSM communications using A5.1 encryption algorithm, an A5.1 Decryptor is utilized. This equipment is used in conjunction with the Semi-Active or the Passive GSM monitoring system. The A5.1 Decryptor has the ability of decrypting A5.1 encrypted GSM communications instantly. Moreover, 32 sessions can be decoded concurrently with the capability to serve the decoding key to five systems in a network, all via one A5.1 Decryptor.

Based on ASIC constituents, the system is a solitary circuit board and is stored within a rugged case along with cooling module and is managed by the administering PC, which is accountable for communication betwixt A5.1 Decryptor and Interception System.

Further, the GSM Monitoring System delivers A5.1 encoded bit stream to A5.1 Decryptor, typically 1 encrypted burst originated from downlink pathway. A5.1 Decryptor assesses the ciphering key Kc and directs it back to the monitoring system. The Monitoring System then employs Kc and deciphers communication. A typical A5.1 decryptor can calculate multiple Kc’s in 1 second.

The GSM Interception Solutions from Stratign: Cell Phone Interceptors

The Mobile Phone Interceptor equipment from Stratign is utilized for GSM monitoring to collect intelligence on criminals and terrorists. It is not mandatory to have a hard-wired link to the cellular provider. This is because the GSM Interceptor can monitor GSM signals, off-the-air.

These Cell Phone Interceptors from Stratign can discern the GSM A5.1 encryption keys utilized in communications in real-time, allowing the user to trace and monitor the actions of suspected terrorists and criminals.

1. Semi-Active Cell Phone Interceptor System


To monitor Voice and SMS from cell phone network without acquiring any aid from service provider, Stratign recommends their off-the-air GSM monitoring system which is constructed to intercept monitor voice and SMS along with call-based data from any GSM network functioning in bands – 850MHz, 900MHz, 1800MHZ, 1900MHz and 3G/4G(LTE)/5G bands. Moreover, it is mainly beneficial to avoid and counteract criminal actions of the targets, to disorder criminal group activity and to implement various tasks in battling against terrorism. The system will permit you to intercept 4/6/12/16/32 cellphones at the same time from any multiple service providers (configurable).

2. Passive Cell Phone Interceptor System


The Passive cell phone Monitoring System is a multi-channel tunable cell phone Monitoring system which can be utilized to monitor communications, globally from any of the service providers. Using A5.1 Decryptor, the system can ensure interception and deciphering of voice conversation from standard 2G/3G/4G/5G Cellular networks in stationary or in mobile environment. The Passive Cell Phone Interception System can carry out several additional tasks while performing monitoring. The system compacts and stores monitored voice calls, SMS’s and protocol data on the control PC hard drive. It has user-friendly interfaces, which allows the user to perform various kinds of tasks, to provide the control of system during its operation. The system can be configured to intercept 8/16/32 duplex transmissions.

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