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Access, Identity and Secure Data Storage in Private Cloud using Digital Signature

Nagendra Kumar1, Ashok Verma2, Ajay Lala3
  1. M.Tech. Scholar, Gyan Ganga Institute of Science & Technology, Jabalpur, M.P., India
  2. Associate Professor, Gyan Ganga Institute of Science & Technology, Jabalpur, M.P., India
  3. Associate Professor, Gyan Ganga Institute of Science & Technology, Jabalpur, M.P., India
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In case of private cloud environment access is limited to a group of users or an organization. Even though there are many aspects in cloud environment. The data security, confidentiality and privacy play a major role in cloud deployment model. In private cloud the identity and secured data storage becomes essential to address. In this paper, a frame work double authentication techniques and specialized procedures is proposed that can efficiently protect the data from the beginning to the end, i.e., from the owner to the cloud and then to the user. A method for Access, identity and secure data storage in private cloud using DS (Digital Signature) is proposed and implemented.


Digital Signature, RSA, Encryption, Authentication


Cloud computing is the best solution for providing a flexible, on-demand, and dynamically scalable computing infrastructure for many applications. Adoption of cloud computing is clearly a strategic direction for many companies. The convergence of inexpensive computing, pervasive mobility, and virtualization technologies has created a platform for more agile and cost-effective business applications and IT infrastructure. In case of private cloud environment access is limited to a group of users or an organization [2]. Even though there are many aspects in cloud environment. The data security, confidentiality and privacy play a major role in cloud deployment model. [2][3][4]. In private cloud the Access, Identity and secured data storage becomes essential to address. [2].
The proposed model has been structured by bringing together various techniques and utilizing them to perform the task of data security in cloud. This combination of diverse methods operate as a wall stood together against the security challenges, which have been constantly creating the loop holes in the efficient functioning and growth of the cloud. This model is described in such a way that it provides a complete view of processing the data at different levels. The model uses Double authentication process to get access to the cloud. It uses Digital Certificates as the main fundamental protection scheme. Encryption is the conversion of data into encrypted form called a cipher text that cannot be easily understood by unauthorized person and can be decrypted by the authorized person having a valid decryption key. Apart from this, the model positively handles the security issues by employing strict authentication parameters, like login-id and password. Thus all these parameters result into a defined mechanism that encourages the proper functioning of cloud computing. In this computing model, owner sends the encrypted data to cloud where it is stored in different sections depending on the sensitivity rating and then the data can be retrieved by user from the cloud when requested. However, this is achievable only after passing the authentication parameters [9].
This paper is structured as follow: Section 2 summarizes the related work for security of data. In Section 3, a model is proposed which is designed to solve the security issue of cloud computing. Section 4 provides the security analysis of the designed model. Section 5 compares functionality of proposed model with other security models. Section 6 shows the evaluation procedure and Section 7 concludes this paper.


The cloud is a terminology with a long history in telephony, which has in the past decade, been adopted as a metaphor for internet based services, with a common depiction in network diagrams as a cloud outline. The underlying concept dates back to 1960 when John McCarthy opinion that ‘‘Computation may someday be organized as a public utility’’; indeed it shares characteristics with service bureaus which date back to the 1960s. The term cloud had already come into commercial use in the early1990s to refer to large Asynchronous Transfer Mode (ATM) networks. By the turn of the 21st century, the term ‘‘cloud computing’’ had started to appear, although major focus at this time was on Software as a Service (SaaS). In 1999, was established by Marc Benioff, Parker Harris. They applied many technologies of consumer web sites like Google and Yahoo! to business applications. They also provided the concept of ‘‘on demand’’ and ‘‘SaaS’’ with their real business and successful customers. IBM extended these concepts in 2001, as detailed in the Autonomic Computing Manifesto, which describes advanced automation techniques such as selfmonitoring, self-healing, self-configuring and self-optimizing in the management of complex IT systems with heterogeneous storage, servers, applications, networks, security mechanisms and other system elements that can be virtualized across an enterprise. played a key role in the development of cloud computing by modernizing their data centers. It found that the new cloud architecture resulted in significant internal efficiency improvements and providing access to their systems by way of Amazon Web Services in 2005 on a utility computing basis. 2007 saw increased activity with Google, IBM and a number of universities embarking on a large scale cloud computing research project, around the time the term started gaining popularity in the mainstream press. In August 2008, Gartner Research observed that ‘‘organizations are switching from company-owned hardware and software assets to per-use servicebased models’’. The projected shift to cloud computing will result in dramatic growth in IT products in some areas and in significant reductions in other areas. Despite all the hope of gaining maximum advantage from this cloud computing, it seems to have born with security and management concerns, which time to time hinders its growth. For this, lot of research work has been done to secure the data in cloud computing (primary concern) from every perspective, but everything seems to face a new challenge as soon as it is employed.


Proposed framework has been structured to provide complete security to the data throughout the entire process of cloud computing, be it in cloud or in transit. We use the Double authentication method (Login/Password, and Digital Signature) for providing the security. Thus, multiple mechanisms and available techniques are applied to shield the critical information from unauthorized parties. The proposed frame work is shown below in Fig.
• Phase 1(Authorization Request)
The user has to get the authority from the Admin of the cloud. The cloud Admin will provide a login id and password to access the cloud.
• Phase 2(Authentication and Validation)
• Once the user filled the login details, it will be asked for the security certificates.
• If the certificate is not install at the client machine, the following security error will occur as shown below in fig 2
• To overcome the problem client has to install the security certificates.
• The certificates will be imported from the Trusted Root Certificate directory of the cloud.
• Now the certificate has to be installed on client machine.
• When the client will login after installation of the certificate, the access to the cloud will be provided without
security error. The security certificate created by us is shown below in Fig.3.
We have used the basic SSL utilities provided to create the certificates. The certificates creation wizard is shown below In Fig. [4, 5].
The algorithm used for creating certificates is RSA. The Key size is 2048.
RSA Algorithm
• Select two large prime numbers a and b.
• Compute n=a*b. The computed n is made public
• Now compute f(n) = (a-1) * (b-1)
• Choose a random number ‘e’ as the public key in the range 1< e < f(n) such that GCD (e, f(n)) = 1.
• Find private key d such that d = e -1 mod f (n), where d and f(n) are mutually prime.
1. Consider the user A that needs to send a message to B in a secured manner using RSA algorithm
2. Now e is B’s public key. Since e is public, A is allowed access to e.
3. For encryption the message M of A which is in the range 0<M<n is converted to cipher
4. Where the Cipher text C = M e mod n.
• Now the cipher text C is sent to B from A.
• User B calculates the Message with its private key ȕ, where message M = C b mod n.


Digital certificates are an essential part of the foundation that enables secure digital communications, providing secure access to data, applications and cloud infrastructures. Digital certificates are an established, standards-based method to enhance trust over vulnerable networks. They are the digital equivalent of a driver’s license or any other form of identity issued by a trusted third party in the physical world. Just as physical IDs ensure trust in the real world, digital certificates ensure trust across the Internet and within private networks, allowing parties to use digital identities to authenticate to each other and subsequently secure transactions and communication between their servers, systems, machines and users in enterprise and cloud environments.
Recently conducted a survey of enterprise IT professionals on the advantages of using a SaaS CA versus an internal CA such as Microsoft Certificate Services. It found that an overwhelming 84 percent of the professionals surveyed use digital certificates to secure applications accessed by internal and external digital identities, and that many of these companies utilize both internal and third-party certificates (Fig 5). The following are key findings of the survey and show how enterprises use CAs to ensure trusted communications.
The analysis of the proposed model for security of data through-out the whole traversing into this cloud computing paradigm comes up with the following mentioned steps where data can be very vulnerable to threats like data leakage, modification, privacy of users and confidentiality etc. The proposed model is designed to tackle all these security issues very efficiently.


As the data needs to be transmitted over a network to the cloud, there are numerous means through which an attacker can easily get into the internet based network and act as a cloud server to the owner of data, hence resulting into the loss of data. To prevent the loss of data in this situation, SSL certification in this model is used. Certificate Authorities (CAs) issue each certificate, which is a credential for the online world, to only one specific domain or server. The cloud server first sends the identification information to the owner when it connects then sends the owner a copy of its SSL Certificate. The owner verifies the certificate and then sends a message to the server and the server sends back a digitally signed acknowledgement to start an SSL encrypted session, enabling encrypted data transfer between the browser and the server. Moreover, the data are stored on the cloud in encrypted form [3].


The data while in transmission to cloud over an internet network can be attacked by various unauthorized interceptors. Since SSL offers encryption that prevents interceptors from reading data traversing the cloud. it is not difficult to crack using today’s computers which can crunch large number combinations quickly in order to determine every possible key in an effort known as a brute force attack. Thus, in proposed model we are using 128-bit SSL encryption which provides more bits of key length than the previous one SSL (40 bit) and also can be shifted to 256-bit whenever required. 128-bit SSL is complex enough to make a brute force attack mostly useless at this time. The proposed model uses strongest encryption, being done by owner and other using SSL. The processing power needed, among other things, would render most attackers ineffective. Hence this approach not only safeguards data where it lives, but also helps assure customers that data is secure while in transit[1][7].


An efficient cloud data security model should be able to overcome all the possible issues of cloud computing, so as to provide the benefits of cloud computing to reach its maximum heights and propel in the direction it is designed for, by preventing the owner’s data from all the risks associated. Table 2 shows the comparison of the proposed model with other data security models.


The proposed technique is analyzed with respect to implementation. This model is tested on a private cloud using Windows server 2012 essential. Fig.6 shows that the status of security after implementation of security parameters namely Digital certificates using RSA and sha1, Security and Encryption technique. Overall, the security of data related to owner is very good. It results in very good security of the proposed model.


The proposed technique provides a way to protect the data, check the integrity and authentication by following the best possible industry mechanisms. It introduces encryption, authentication of user by owner and other by cloud and verification of digital signature of the owner. Proposed method achieves the availability, reliability and integrity of data traversing through owner to cloud and cloud to user. The solution, presents a horizontal level of service, available to all implicated entities, that realizes a security mesh through federations, within which essential trust is maintained.

Tables at a glance

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Table 1 Table 2

Figures at a glance

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