Cellphones have become an essential part of today’s world. Several standards have been propositioned for 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.
Which is A5.1 Decryptor?
To decipher GSM communications using the 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 to decrypt 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 a cooling module and is managed by the administering PC, which is accountable for communication between A5.1 Decryptor and Interception System.
Further, the GSM Monitoring System delivers an A5.1 encoded bit stream to A5.1 Decryptor, typically 1 encrypted burst originated from the 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.