SPRING SOURCE TECHNOLOGIES

ABSTRACT                 With data storage and sharing services in the cloud, users can easily modify and share data as a group. To ensure share data integrity can be verified publicly, users in the group need to compute signatures on all the blocks in shared data. Different blocks in shared data are generally signed by different users due to data modifications performed by different users. For security reasons, once a user is revoked from the group, the blocks which were previously signed by this revoked user must be re-signed by an existing user. The straightforward method, which allows an existing user to download the corresponding part of shared data and re-sign it during user revocation, is inefficient due to the large size of shared data in the cloud. In this paper, we propose a novel public auditing mechanism For the integrity of shared data with efficient user revocation in mind. By utilizing the ...

#include <REGX52.H> #include <string.h> #include <ctype.h> #include "lcd.c" #include "serial.c" #define MAX_DELAY() delay(65000) sbit Device=P0^0; bit Dev_Stat=0; unsigned char SE_INTR_ST = 0; unsigned char re_str[6], number[14]; unsigned char dummy[6]; void intro() {  lcd_init();  lcd_str(" Applaince Ctrl ",0x80);  lcd_str("Using GSM - 8051",0xc0);  MAX_DELAY();MAX_DELAY(); MAX_DELAY();MAX_DELAY();  lcd_clr();  } void serial0() interrupt 4 { char z; if(RI==1) { z=SBUF;RI=0; if(z=='+') SE_INTR_ST = 1; } } void temp_receive(unsigned char r) { unsigned char ten; do { ten=se_rx(); }while(ten!=r); } void gsmread(const unsigned char *str,char limit,unsigned char *dummy_str) { unsigned char i,temp,lmt_chk = 0; lcd_clr(); while(*str!='\0') { se_tx(*str); str++; } se_tx('\r');//se_tx(0x0a); if(limit==1) { for...

Dynamic and Public Auditing with Fair Arbitration for Cloud Data ABSTRACT           Cloud users no longer physically possess their data, so how to ensure the integrity of their outsourced data becomes a challenging task. Recently proposed schemes such as “provable data possession” and “proofs of retrievability” are designed to address this problem, but they are designed to audit static archive data and therefore lack of data dynamics support. Moreover, threat models in these schemes usually assume an honest data owner and focus on detecting a dishonest cloud service provider despite the fact that clients may also misbehave. This paper proposes a public auditing scheme with data dynamics support and fairness arbitration of potential disputes. In particular, we design an index switcher to eliminate the limitation of index usage in tag computation in current schemes and achieve efficient handling of data dynamics. To address the fairness...

CLOUD WORKFLOW SCHEDULING WITH DEADLINE AND TIME SLOT ALGORITHM Abstract Allocating service capacities in cloud computing is based on the assumption that they are unlimited and can be used at any time. However, available service capacities change with workload and cannot satisfy users’ requests at any time from the cloud provider’s perspective because cloud services can be shared by multiple tasks. Cloud service providers provide available time slots for new user’s requests based on available capacities. In this paper, we consider workflow scheduling with deadline and time slot availability in cloud computing. An iterated heuristic framework is presented for the problem under study which mainly consists of initial solution construction, improvement, and perturbation. Three initial solution construction strategies, two greedy- and fair-based improvement strategies and a perturbation strategy are proposed. Different strategies in the three phases result in several heuristics. ...

Inverted Linear Quadtree: Efficient Top K Spatial Keyword Search ABSTRACT: In this paper, With advances in geo-positioning technologies and geo-location services, there are a rapidly growing amount of spatiotextual objects collected in many applications such as location based services and social networks, in which an object is described by its spatial location and a set of keywords (terms). Consequently, the study of spatial keyword search which explores both location and textual description of the objects has attracted great attention from the commercial organizations and research communities. In the paper, we study two fundamental problems in the spatial keyword queries: top k spatial keyword search (TOPK-SK), and batch top k spatial keyword search (BTOPK-SK). Given a set of spatio-textual objects, a query location and a set of query keywords, the TOPK-SK retrieves the closest k objects each of which contains all keywords in the query. BTOPK-SK is the batch processing of sets...

A Shoulder Surfing Resistant Graphical Authentication System Abstract : Authentication based on passwords is used largely in applications for computer security and privacy. However, human actions such as choosing bad passwords and inputting passwords in an insecure way are regarded as ”the weakest link” in the authentication chain. Rather than arbitrary alphanumeric strings, users tend to choose passwords either short or meaningful for easy memorization. With web applications and mobile apps piling up, people can access these applications anytime and anywhere with various devices. This evolution brings great convenience but also increases the probability of exposing passwords to shoulder surfing attacks. Attackers can observe directly or use external recording devices to collect users’ credentials. To overcome this problem, we proposed a novel authentication system PassMatrix, based on graphical passwords to resist shoulder surfing attacks. With a one-time valid login indicator ...