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secure file storage on cloud using hybrid Cryptography ppt.pptx

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secure file storage on cloud using hybrid Cryptography ppt.pptx

  2. 2. INTRODUCTION  Cloud storage is a convenient and reliable option to store and retrieve data.  The information over internet is becoming a critical issue.  Cryptography concept is used for securing storage system of cloud.
  3. 3. LITERATUR SURVEY  Punam V Maitri, Aruna Verma ”Data security and cloud computing issues”  Joseph Selvanayagam, Akash Singh, Joans Michael, and Jaya Jeswani “Secure File Storage on Cloud using cryptography”
  4. 4. EXISTING SYSTEM  User selects the file from the local storage.  The file will be uploaded to the cloud after getting encrypted.  It uses AES algorithms.  It needs some more time for encryption and decryption process.
  5. 5. PROPOSED SYSTEM  The Proposed system is designed to provide high security to the data.  It converts the plain text into a cipher text and store it into the cloud.  It uses AES, 3DES and RC6 algorithms for data encryption and decryption.  It uses multithreading technique.
  6. 6. MODULE DESCRIPTION Register User can register themselves by giving username, password, address, email-id and phone number. Login User can login using credentials. Data encryption Data will be encrypted using AES,3DES and RC6 algorithms.
  7. 7.  File upload Encrypted file will be uploaded to the cloud.  Request for file If user wants to download a file then user needs to request for a file to the cloud.  Data decryption Data will be decrypted by using AES, 3DES and RC6 algorithm.
  9. 9. SYSTEM REQUIREMENTS Hardware requirements  System : Intel Core i3  Hard Disk : 250 GB  RAM : 4 GB  Processor : i3 7th Generation Software requirements  Operating system : Windows 7 and above  Front End :HTML,CSS, JavaScript  Back End :SQLite Server
  10. 10. CONTEXT FLOW DIAGRAM(CFD) Admin User Secure file storage system Cloud Login Login Encrypt Decrypt
  11. 11. DATA FLOW DIAGRAM(DFD) Plaintext Encryption Cipher text User Decryption Plaintext Decrypted file Cloud Login Request for file File Mail ID and Password Level-1 DFD for System
  12. 12. DFD LEVEL-2 for ADMIN Admin Login View user details Database Mail ID and Password Check for mail ID And Password Login Successful If mail ID and Password mismatch
  13. 13. DFD LEVEL-2 for USER User Encryption Decryption session started Register Login Database Mail ID and Password Check for Mail ID And Password Login successful If Mail ID and Password mismatch Error if user already exists
  14. 14. ER Diagram 14
  15. 15. ALGORITHMS USED Advanced Encryption Standard (AES)  In present day cryptography, AES is widely adopted and supported in both hardware and software.  AES uses symmetric key encryption.  It takes plaintext in blocks of 128,192, and 256 bits.  Stronger and faster than Triple-DES.
  16. 16. step1: Substitute Bytes/ Sub Bytes  AES defines a 16*16 matrix of byte values, called an S-box, That contains a permutation of all possible 256 8-bit values.
  17. 17. Below table is the inverse S-box. It will be used during decryption process.
  18. 18. step2: Shift row transformation Rules of shifting rows, 1) Row 1 = No shifting 2) Row 2 =1 byte left shift 3) Row 3 = 2 byte left shift 4) Row 4 = 3 byte left shift
  19. 19. Step 3 : MixColumn The mix column transformation operates on each column individually.
  20. 20. Step 4 : AddRoundKey The state array which is 128 bit value is XORed with the AddRoundKey value and it will generate cipher text.
  21. 21.  Triple DES is used to increase the complexity and reduce the weakness of DES.  3DES is based on the DES algorithm.  It works by taking three 64-bit keys.  It has two-key and three-key versions.  In the two-key version, the same algorithm runs three times , but uses k1 for the first and last step. Triple Data Encryption Standard (3DES)
  22. 22. 3DES with three keys(Encryption and Decryption) Mathematical equation i. C1=E(K1,P) ii. C2=E(K2,C1) => C2=E(K2,E(K1,P) iii. C3=E(K3,C2) C3=E(K3,E(K2,C1)) C3=E(K3,E(K2,E(K1,P)))
  23. 23. Decryption Mathematical equation i. C2=D(K3,C3) ii. C1=D(K2,C2) => C1=D(K2,D(K1,C3) iii. P=D(K1,C1) P=D(K1,D(K2,C2)) P=D(K1,D(K2,D(K1,C3)))
  24. 24. Rivest Cipher 6 (RC6)  It was developed based on RC5 and does its job quicker than RC5.  RC6 uses four working block size registers in its algorithmic computations.  It has a block size of 128 bits  It supports key sizes of 128,192, and 256bits up to 2040 bits.
  25. 25. How RC6 works Steps: 1) Pre Whitening 2) Loop of similar round 3) Post Whitening
  26. 26. ADVANTAGES AND DISADVANTAGES Advantages  Less time is used for encryption and decryption process.  It provides safe backup.  Data is kept secured on cloud which avoids unauthorized access. Disadvantage  Needs active internet connection to connect with cloud server.
  27. 27. FUTURE SCOPE  We can also improve the system by supporting more file formats.  In Future we can use different algorithms for encryption and decryption.
  28. 28. CONCLUSION  In today’s world data security and privacy protection are the primary problems.  We exploit the technique of cryptography encryption to protect data files in the cloud  Cryptography techniques convert original data into Cipher text. So only legitimate users can access data from the cloud storage server.
  29. 29. THANK YOU