【正文】 T), the slightly newer LG 4400 (Verizon), and the recently released highend Treo 650 (Sprint) containing a 1GB removable memory stick. Mobile device capacity was observed by slowly sending messages to the target phone until a warning indicating a full inbox was displayed. The resulting device buffer capacities varied as shown in Table . 畢業(yè)設(shè)計（論文） 外文翻譯 11 Table Mobile Device SMS Capacity The delivery discipline experimentation results indicate how the SMS system will react to an in?ux of text messages. We con?rmed that ?nite buffer capacities exist in most SMSCs and mobile the event of a DoS attack, messages exceeding these saturation levels will be lost. Therefore, a successful DoS attack must be distributed over a number of subscribers. Delivery Rate The speed at which a collection of nodes can process and forward a message is the delivery particular, bottlenecks are discovered by paring injection rates with delivery rates. Additionally, due to variations in injection size for different interfaces,the injection size per message is estimated. Determining the maximum injection rate for a cellular work is an extremely dif?cult exact number of SMSCs in a work is not publicly known or discoverable. Given the sheer number of entrances into these works, including but not limited to website interfaces, , instant messaging, and dedicated connections running the Short Messaging Peer Protocol (SMPP), we conservatively estimate that it is currently possible to submit between several hundred and several thousand messages per second into a work from the Inter using simple interfaces. A brief sampling of available interfaces is provided in Table interfaces can be grouped into three main categories: instant messaging, information services, and bulk SMS. Instant messaging provides the same functionality as text messaging, but connects new works of users to cellular works. With 24 hour news,customers are frequently ?ooded with “on the go” updates of headlines, sports, and stocks from information service providers such as CNN and MSNBC. Lastly, through bulk SMS providers, panies can provide employees with updates ranging from server status to general of?ce noti?cations. While injection rates for instant messaging and the information services are unknown, the bulk SMS providers offer plans with rates as high as 3035 messages per second, per SMPP connection. Furthermore, by using multiple SMPP connections, START Corp. () offers rates “an order of magnitude” greater. Combining all of these conduits provides an adversary with the ability to inject an immense number of messages. 畢業(yè)設(shè)計（論文） 外文翻譯 12 When message delivery time exceeds that of message submission, a system is subject to DoS attacks. We therefore pare the time it takes for serially injected messages to be submitted and then delivered to the targeted mobile device. This was acplished via a PERL script designed to serially inject messages approximately once per second into each provider’s web interface. From this, we recorded an average send time of seconds. Measurement of ining messages was more dif?cult due to a lack lowlevel access to the device operating system. Via informal observation, we recorded interarrival times of 78 seconds for both Verizon and ATamp。因此，拒絕服務(wù)攻擊要成功，必須有分布式的大量用戶。 當(dāng)終端設(shè)備的短信緩存區(qū)是滿的，網(wǎng)絡(luò)中的短信被保留在短消息服務(wù)中心的緩存中。 我們發(fā)現(xiàn)， AT＆ T 的短消息服務(wù)中心的緩沖區(qū)能存放 400 條短信 .這看起來似乎很大， 400 條含 160 字節(jié)的信息量大小也只有 。 短消息服務(wù)中心 是短信服務(wù)的核心，所有的信息必須通過他們。為了彌補這個差距，我們進行灰盒測試 [7， 14]。最后，通過這次的灰盒測試，我們評估網(wǎng)絡(luò)抵御這些攻擊的能力。 雖然這些網(wǎng)絡(luò)設(shè)計能處理高于原有理論的容量，但如此大量的通話需求遠遠超過它的極限值，影響語音通信能力。如果不是文本信息，而是進行呼叫接續(xù)，則上述所有的信道以同樣的方式傳輸信號，來建立業(yè)務(wù)信道的連接。公用控制信道是包含尋呼信道（ PCH）和隨機接入信道（ RACH）組成的邏輯信道，用于基站進行語音信號和 SMS 數(shù)據(jù)的傳輸機制。否則，響應(yīng)將包含移動交換中心（ MSC）目前提供服務(wù)的地址。由于這項服務(wù)日益普及，因此，服務(wù)提供商提供支持多種不同的短消息服務(wù)中心的服務(wù)變得普遍起來，以此來增加容量。 畢業(yè)設(shè)計（論文） 譯文及原稿 譯文題目 ： 在 SMS 蜂窩網(wǎng)絡(luò)上進行開放式功能的開發(fā)