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![A. D. Patel Institute Of Technology
Information and Network Security [2170709] : A. Y. 2019-20
Secure Hash Algorithm (SHA)
Prepared By :
Dhruv V. Shah (160010116053)
B.E. (IT) Sem - VII
Guided By :
Dr. Sudhir Vegad
(Head Of CP Dept. , ADIT)
Department Of Information Technology
A.D. Patel Institute Of Technology (ADIT)
New Vallabh Vidyanagar , Anand , Gujarat
1](https://image.slidesharecdn.com/160010116021-53-160014116001t01-191210093313/75/Secure-Hash-Algorithm-SHA-1-2048.jpg)
![A. D. Patel Institute Of Technology
Information and Network Security [2170709] : A. Y. 2019-20
Secure Hash Algorithm (SHA)
Prepared By :
Dhruv V. Shah (160010116053)
B.E. (IT) Sem - VII
Guided By :
Dr. Sudhir Vegad
(Head Of CP Dept. , ADIT)
Department Of Information Technology
A.D. Patel Institute Of Technology (ADIT)
New Vallabh Vidyanagar , Anand , Gujarat
1](https://crownmelresort.com/image.slidesharecdn.com/160010116021-53-160014116001t01-191210093313/75/Secure-Hash-Algorithm-SHA-1-2048.jpg)
Uploaded byShahDhruv21
Secure Hash Algorithm (SHA)
The document discusses the Secure Hash Algorithm (SHA) and provides details about its purpose, working, steps, and applications. SHA was developed by NIST and NSA to provide authentication, not encryption. It works by hashing message content into fixed-length values to detect changes to data. The steps involve padding bits, appending length, dividing input into blocks, initializing variables, and processing blocks by copying variables and dividing the block into sub-blocks. SHA is used for password logins, digital signatures, integrity checking, and authentication in applications like PGP, SSL, and SSH.
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Secure Hash Algorithm (SHA)
- 1. A. D. PatelInstitute Of Technology Information and Network Security [2170709] : A. Y. 2019-20 Secure Hash Algorithm (SHA) Prepared By : Dhruv V. Shah (160010116053) B.E. (IT) Sem - VII Guided By : Dr. Sudhir Vegad (Head Of CP Dept. , ADIT) Department Of Information Technology A.D. Patel Institute Of Technology (ADIT) New Vallabh Vidyanagar , Anand , Gujarat 1
- 2. Outline Introduction Purpose Working and MessageContent Diagram Pseudo code Steps Applications 2
- 3. Introduction What is SHA? SHA stands for Secure Hash Algorithm. It was developed by National Institute Of Standards and Technology(NIST) along with National Security Agency(NSA). In 1993, SHA was established as federal information processing standard. It has different versions : SHA – 0 SHA – 1 SHA – 2 SHA - 3 3
- 4. Purpose 4 Key Purpose: Authentication not Encryption. Authentication Requirements : Masquerade - insertion of message from fraudulent sources. Content Modification – changing content of message. Sequence Modification – insertion, deletion and reordering sequence. Timing Modification – replaying valid sessions.
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- 7. Pseudo Code Steps 7 Followingsteps are carried out to apply SHA algorithm to a given message :- 1. Padding of Bits – 128 short of a multiple of 1024. 2. Append Length. 3. Divide the input into 1024-bit blocks. 4. Initialize Chaining Variables. A= 6A09E667F3BCC908 B= BB67AE8584CAA73B C= 3C6EF372FE94F82B D= A54FF53A5F1D36F1 E= 510E527FADE6821D F= 9B05688C2B3E6C1F G= 1F83D9ABFB41BD6B H= 5BE0CD19137E2179 5. Process Blocks i. Copy the variables A-H to a-h. ii. Divide the 1024-bit block into 16 sub blocks of 64-bit each.
- 8. 8 Applications Public KeyAlgorithms – Password Logins – Encryption Key Management – Digital Signatures Integrity Checking – Virus and Malware Scanning Authentication – Secure Web Connections (PGP, SSL, SSH, S/MIME)
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