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SDA Releases GSM Voice-Privacy Algorithm A5/1
The Smartcard Developer Association (SDA) and two U.C. Berkeley researchers released A5/1, the "stronger" of the two GSM voice-privacy algorithms back in 1998. Continued research in the area has resulted in a number of recent (2007/2008) articles.SDA Shows Cloning of Digital GSM Cellphones Possible
The Smartcard Developer Association (SDA) and two U.C. Berkeley researchers discovered that digital GSM cellphones are susceptible to cloning.
- GSM providers wishing to receive assistance in repairing the flaws the SDA discovered are encouraged to email our GSM security experts
- Download the formerly secret authentication and
voice
privacy key generation algorithm used in GSM
This information is provided for purposes of encouraging public research and independent review, in hopes that it will lead to a better understanding of how GSM security can be improved.
Note: this server is located outside the United States. The algorithm was legally exported from the US in paper form.
We have made available an overview of our results, including some detailed technical information.
To get in touch with us, send email to gsm@scard.org.
Readers of the scard mailing list have pointed out that, in Europe, one can anonymously rent GSM cellphones quite cheaply. The prospect of those phones getting cloned is a bit worrisome.
See also some discussion on GSM cloning archived on John Young's jya.com site.
For further information about the SDA refer to the
about section for contact details.
1998/1999 GSM SDA related press coverage
| Title of Press Release | Date of Release | Appeared in |
| GSM Cellphones Cloned | 13th April 1998 | The Wall Street Journal |
| Code cracked on a digital cellular phone | 13th April 1998 | USA Today |
| Cell-Phone Security Far From Airtight | 13th April 1998 | Wired News |
| Clone for the Holidays | 13th April 1998 | Time Daily |
| Concerned Telecom and Network Security Specialists Respond to Claims of GSM Cellular Phone Cloning | 13th April 1998 | Crossbar Security |
| CTIA Response to the Announcement | 14th April 1998 | Wireless Daily News |
| Researchers Crack Code in Cell Phones | 14th April 1998 | The New York Times |
| Cryptographers Crack Cell Phone Code | 14th April 1998 | ABC News | Digital Cell Phone Code Cracked | 14th April 1998 | Associated Press | GSM Cell Phones can be cloned | 14th April 1998 | The Netly News | Cryptographers crack digital cell phone code | 14th April 1998 | CNN | Cell Phone Junkies Beware | 14th April 1998 | The Daily Californian |
| Omnipoint to Alter Wireless Formulas | 15th April 1998 | The Los Angeles Times |
| GSM MoU Association Responds to Recent Claims of Compromise to GSM Security | 15th April 1998 | Wireless Daily News |
| GSM Cell Phones Called Secure | 17th April 1998 | International Herald Tribune |
| CODEBREAKERS | 20th April 1998 | Time magazine |
| Security questioned | 21st April 1998 | Public Network Europe Newswire |
| US 'crack' could leave Optus and Telstra GSM mobile networks open to fraud | 24th April 1998 | Lan Magazine Australia New Zealand |
| CCC Announces successfully working CLONE | 25th April 1998 | Chaos Computer Club |
| Aussichten eines Klons | 25th April 1998 | Der Spiegel - Germany |
| GSM SIM Emulator Released | 25th April 1998 | Hack Watch News |
| Card clone gives mobile phone security a jolt | 27th April 1998 | Sydney Morning Herald - Australia |
| Unsicherheit durch Geheimniskrämerei | 27th April 1998 | Der Spiegel - Germany |