Termin:Chaotic-Congress-Cinema-28C3 Nr. 04Aus Attraktor WikiVersion vom 23. Januar 2012, 20:00 Uhr von Muelli (Diskussion | Beiträge)
Chaotic Congress Cinema Nr. 4
Wir schauen uns die Aufzeichnung von Congress-Vorträgen an. Du bist herzlich eingeladen, in den Clubräumen im Mexikoring 21 aufzutauchen und mit uns die Talks anzuschauen und zu diskutieren. Es wird Getränke und Knabberkram zu moderaten Preisen geben. Falls Du kein CCC-, CCCHH- oder Attraktor e.V.-Mitglied bist, macht das überhaupt nichts: Alle Gäste sind gern gesehen. :-) Weitere Informationen unter Chaotic Congress Cinema. Inhaltsverzeichnis
Cellular protocol stacks for InternetGPRS, EDGE, UMTS, HSPA demystified Almost everyone uses the packet oriented transmission modes of cellular networks. However, unlike TCP/IP, Ethernet and Wifi, not many members of the hacker commnunity are familiar with the actual protocol stack for those services. This talk is aimed to give an in-depth explanation how the lower layer protocols on the air and wired interfaces for packet data services in cellular networks are structured. For 2.5/2.75G, this includes RLC/MAC, NS, BSSGP, LLC, SNDCP, GTP For 3G/3.5G, this includes RRC, RLC, PDCP, NBAP, RANAP Links+ `OpenBSC project (includes OsmoSGSN) <http://openbsc.osmocom.org/>`__ + `http:// <http://>`__
Electronic money: The road to Bitcoin and a glimpse forwardHow the e-money systems can be made better The proposed talk provides a definition of the problem of creating e-money and after a review of the state of the art points out possible solutions and proposes questions for discussion for the properties of electronic money system. Electronic money: The road to Bitcoin and a glimpse aheadAbstract : *The proposed talk provides a definition of the problem of creating e-money and after a review of the state of the art points out possible solutions and proposes questions for discussion for the properties of electronic money system.* 1. What is electronic money and different means of currencyDefinition of electronic money and distinction from similar means of exchange. Electronic money is defined as monetary value which is:
Other means of exchange, similar to e-money: Alternative/Social/Timeshare/Community currencies; Loyalty and Voucher systems. > Working examples: WIR and Ven currencies (Bitcoin)< p> What makes them different from e-money? (convertible only one-way, not a legal tender, mostly backed by trust only, etc)
2. Defining the e-money problem: What electronic money should do?Risks and requirements to the solution for electronic money from technical, legal and business standpoint. The basic human problem of reaching a consensus and trust in a group. General system risks:+ Credit Liability + Credit Abuse + Counterfeiting + Unauthorized Withdrawal + Purchase Order Modification + Double Spending + Failure to Credit Payment + Denial of Service + Repudiation + Failure to deliver + Framing + Secrecy Legal and accounting:+ Dispute resolution + Money laundering and finance of terrorism + Tax evasion prevention + Consumer protection requirements + Ways to negotiate and conclude a contract + Auditability + Reverse and chargeback transactions + How the burden of proof is distributed Business:Costs for:
Accent on the most important human problems:+ Identification and authorization (which is the required minimum?) + Achieving consensus and easy dispute resolution in a group. + Determine the state of the system at any given moment + Trust (between the peer users or trust in the central authority) 3. How the risks and requirements have been traditionally addressed?Review of the cryptographic, legal and procedural methods from the existing e-money protocols. Еmphasis on anonymity and privacy problems. The review of the existing systems will be a distinction between:
PayWord based systems + Centralized and decentralized systems > Example: Liberty Reserve and Ripple BitCoin + Hard and Soft systems > Example: BitCoin and Credit card based money and payment protocols< li>
How they provide anonymous transactions and keep user privacy? Are independent jurisdictions a (contribution to) the solution? Calculated risk, insurance and responsibility/role delegation as patches to the existing problems. Which of the above systems may be deemed "legal"? (what do the central banks think)
the protocols around them 4. The great step forward. The contribution of BitcoinEmphasis on decentralization and (relative) anonymity features of Bitcoin. How the combination of a way to create(mint) coins and to timestamp the state of their distribtion created the first working non-centralised currency. What, in my opinion, contributed for the Bitcoin popularity. 5. The problems of BitcoinWhat Bitcoin doesn't provide or doesn't provide in an effective manner:
6. A Glimpse forwardHow can anonymous e-money be made better (more effective and accessible). Proposal (and discussion) of the possible enchancements. How to issue e-money in more effective manner?Possible solutions are to issue money based on:
How to reach a consensus in a group in a more effective manner?+ Is practical byzantine tolerance more effective than distributed timestamping? + Can and should we consider any centralized authority? + Should we consider decentralized money impossible and settle for distributed money? + Can a Webtrust (OpenPGP alike) scheme of trust be applied? What social identification (friend of a friend) can contribute? + Can we use/rely on public/official timestamping services and how this can be used as a better proof? + How triple accounting techniques may help? How to achieve anonimity and preserve privacy?+ Is complete anonymity possible? What are the achievable levels of anonymity? + Can the user set a "mode" of a transaction, sacrificing some protection? + To what extend the existing bank secrecy will suffice? + Jurisdictional independence as a possible solution / significant contributor. + What anonymizing technical methods are possible?
If not are features like: consumer protection (reverse and refund transactions), auditability and settlement risk coverage need to be implemented and at what cost? |