As Vice highlights, GEA-1 was used to encrypt cell phone data primarily in the 1990s and 2000s. The algorithm was originally said to offer full 64-bit security but in their cryptanalysis, the team found that its security was limited to just 40-bit, by design.
https://www.techspot.com/news/90107-new-report-finds-early-cellphone-encryption-algorithm-intentionally.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/90107-new-report-finds-early-cellphone-encryption-algorithm-intentionally.html?utm_source=dlvr.it&utm_medium=blogger