Name
Abstract | ||
|---|---|---|
Digital Video Broadcasting (DVB) is a set of standards for digital television. DVB supports the encryption of a transmission using the Common Scrambling Algorithm (DVB-CSA). This is commonly used for PayTV or for other conditional access scenarios. While DVB-CSA support 64 bit keys, many stations use only 48 bits of entropy for the key and 16 bits are used as a checksum. In this paper, we outline a time-memory-tradeoff attack against DVB-CSA, using 48 bit keys. The attack can be used to decrypt major parts a DVB-CSA encrypted transmission online with a few seconds delay at very moderate costs. We first propose a method to identify plaintexts in an encrypted transmission and then use a precomputed rainbow table to recover the corresponding keys. The attack can be executed on a standard PC, and the precomputations can be accelerated using GPUs. We also propose countermeasures that prevent the attack and can be deployed without having to alter the receiver hardware. |
Year | DOI | Venue |
|---|---|---|
2011 | 10.1007/978-3-642-34159-5_4 | WEWoRC |
Keywords | Field | DocType |
corresponding key,dvb-csa support,dvb-csa encrypted transmission online,conditional access scenario,bit key,encrypted transmission,digital video broadcasting,digital television,common scrambling algorithm,time-memory-tradeoff attack | Checksum,Conditional access,Rainbow table,Block cipher,Computer science,Common Scrambling Algorithm,Computer network,Digital television,Encryption,Digital Video Broadcasting,Embedded system | Conference |
Citations | PageRank | References |
2 | 0.37 | 4 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Erik Tews | 1 | 281 | 20.11 |
| Julian Wälde | 2 | 2 | 0.37 |
| Michael Weiner | 3 | 10 | 1.58 |