This presentation will give brief overview on cloud computing and some basic types of encryption used in securing data in could computing

1. Seminar Presentation
on
Security Issues in Cloud Computing
Presented by :
Jyotika Pandey
4th year , JIET-SETG
Rollno.- 10EJTIT013

2. What is Cloud Computing ?
• Cloud computing means ability to run a program or
application on many connected computer at the same time.
• NETWORK BASED SERVICES provided by VIRTUAL
SERVERS, server which do not actually exits and which are
actually stimulated by software running on real machines.
• NOTE: as virtual server do not actually exist physically, they
can be scaled up, moved from place to place just like
CLOUD.
• “Cloud” is basically a metaphor for “internet”.

3. How does this happen:
• The seller actually purchases the energy consuming server and host
the product and services from the remote location so that the user
don’t have to , they can simply logon into network without install
anything.
• GOOGLE, AMAZON, MICROSOFT AZURE are some of the
suppliers.

4. CLOUD COMPUTING SERVICES:
• Software as a service SAAS : End user
• Platform as a services PAAS : Application Developer
• Infrastructure as a service IAAS : Network Architect

5. Cloud Architecture

6. Service Models
• IAAS: It provides computer – physical, virtual machines .
• The service can be scaled up and down according to consumer needs
software bundles , firewalls , cost reflects the amount of resources
allocated and consumed.
• PAAS: It provides the operating system , application platform
development environment, web servers , data base etc,
• The resource automatically scales up (modify) the resources so that the
user does not have to manually allocate resource.
• SAAS: In SAAS the user is provided application to software and database
and cloud provider manages the infrastructure and platform.
• It is usually the on demand software which the user pay on the pay – per –
use basis.
• Scalability: the application software can use vary no. of users.
• Load Distributer : It distributes the work load over machines.

7. Deployment Models
Public Cloud
• Computing infrastructure is shared by various organizations.
• E.g. : Amazon, Google, Microsoft
Private Cloud
• The computing infrastructure is dedicated to a particular
organization and not shared with other organizations.
• more expensive and more secure when compare to public cloud.
• E.g. : HP data center, IBM, Oracle
Hybrid Cloud
• Organizations may host critical applications on private clouds.
• where as application which requires relatively less security
concerns on public cloud.
• usage of both public and private together is called hybrid cloud.

8. Security :
• Although cloud computing has achieve a huge success in various
industries but there is a huge a concern in the field of information
system and security. Various issues has been raised regarding
the security of data being saved on the provider‟s cloud and
security when the data is being transmitted.
• To make the data secure from various attack, encryption of data is
needed to before it is stored and transmitted.

9. Encryption Techniques: Blowfish Algorithm
• Blowfish is a symmetric block cipher encryption algorithm meaning
that it uses the same secret key to both encrypt and decrypt messages
• It Divides a message up into fixed length blocks during encryption
and decryption.
• The block length for Blowfish is 64 bits; messages that aren't
multiple of eight bytes in size must be padded.
• It takes a variable-length key, from 32 bits to 448 bits, making it
ideal for securing data.
• It is suitable for applications where the key does not change often,
like a communications link or an automatic file encryptor. It is
significantly faster than most encryption algorithms

10. Blowfish Algorithm : Working
• Split each block into halves
• Right half becomes new left half
• New right half is the final result when the left half is XOR„d with the
result of applying f to the right half and the key.

11. AES Algorithm ( Advenced Encryption
Algorithem )
• AES is a symmetric block cipher. This means that it uses the
same key for both encryption and decryption.
• Accept a block size of 128 bits;
• A choice of three keys - 128, 192, 256 bits.
• Depending on version of key used, the name of the standard is
modified to AES-128, AES-192 or AES- 256 respectively.
• 10 rounds -128-bit keys,
12 rounds -192-bit keys,
14 rounds - 256-bit keys.
Note : Except for the last round in each case, all other rounds are
identical

12. RSA Algorithm ( Revist-Shamir-
Aldeman
• Most commonly used encryption and authentication algorithm
• It is included as part of the Web browsers from Microsoft and
Netscape.
• It involves a public key and a private key. The public key can be
known to everyone and is used for encrypting messages.
• The basic steps of RSA algorithm are:
• Key Generation
• Encryption and
• Decryption

13. RSA Algorithem : Working ( cont.)

14. RSA Algorithem : Working ( cont.)
• Multiplying two large prime no. and do some
processing on it .
• Key created : Public and private key
• The private key is used to decrypt text that has
been encrypted with the public key.

15. Summery
• Cloud computing is revolutionizing the way business is
carried out in various industries (Government, Healthcare,
Software etc.), use of information technology resources and
services, but the revolution always comes with new problem.
• One of the major problems associated with Cloud computing
is Security.
• Various Security issues and Algorithms to deal with data
security issues are discussed .
• Discussed the advantages, services of the cloud and the
different deployment models.
• In future, security algorithms will be implemented producing
results to justify the concepts of security for cloud computing
and comparing them to find out which is the most efficient
one.

16. Queries ???

17. Thank You !