Abstract
The DECT Standard Cipher (DSC) is a proprietary stream cipher used for enciphering payload of DECT transmissions such as cordless telephone calls. The algorithm was kept secret, but a team of cryptologists reverse-engineered it and published a way to reduce the key space when enough known keystreams are available [4]. The attack consists of two phases: At first, the keystreams are analyzed to build up an underdetermined linear equation system. In the second phase, a brute-force attack is performed where the equation system limits the number of potentially valid keys. In this paper, we present an improved variant of the first phase of the attack as well as an optimized FPGA implementation of the second phase, which can be used with our improved variant or with the original attack. Our improvement to the first phase of the attack is able to more than double the success probability of the attack, depending of the number of available keystreams. Our FPGA implementation of the second phase of the attack is currently the most cost-efficient way to execute the second phase of the attack.
Original language | English |
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Title of host publication | Information Security and Cryptology - ICISC 2010 |
Subtitle of host publication | 13th International Conference, Seoul, Korea, December 1-3, 2010, Revised Selected Papers |
Editors | Kyung Hyune Rhee, DaeHun Nyang |
Place of Publication | Berlin |
Publisher | Springer |
Pages | 177-188 |
Number of pages | 12 |
ISBN (Electronic) | 978-3-642-24209-0 |
ISBN (Print) | 978-3-642-24208-3 |
DOIs | |
Publication status | Published - 2010 |
Externally published | Yes |
Event | 13th International Conference on Information Security and Cryptology, ICISC 2010 - Seoul, Korea, Republic of Duration: 1 Dec 2010 → 3 Dec 2010 Conference number: 13 |
Publication series
Name | Lecture Notes in Computer Science |
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Publisher | Springer |
Volume | 6829 |
ISSN (Print) | 0302-9743 |
ISSN (Electronic) | 1611-3349 |
Conference
Conference | 13th International Conference on Information Security and Cryptology, ICISC 2010 |
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Abbreviated title | ICISC |
Country/Territory | Korea, Republic of |
City | Seoul |
Period | 1/12/10 → 3/12/10 |
Keywords
- DECT
- DECT Standard Cipher
- DSC
- Stream Cipher
- FPGA
- Hardware-Accelerated Cryptanalysis