The document describes the SHA-1 hashing algorithm. SHA-1 produces a 160-bit hash value from an input of arbitrary length. It works by padding the input, appending the length, initializing hash buffers, processing the message through 80 rounds of compression, and outputting the final hash value. The compression function divides the padded message into 16-word blocks and schedules the words through the rounds using a message scheduling algorithm. It performs logical and bitwise operations on the words and chaining variables to generate a new hash.
Security Hash Algorithm (SHA) was developed in 1993 by the National Institute of Standards and Technology (NIST) and National Security Agency (NSA).
It was designed as the algorithm to be used for secure hashing in the US Digital Signature Standard.
• Hashing function is one of the most commonly used encryption methods. A hash is a special mathematical function that performs one-way encryption.
• SHA-l is a revised version of SHA designed by NIST and was published as a Federal Information Processing Standard (FIPS).
• Like MD5, SHA-l processes input data in 512-bit blocks.
• SHA-l generates a 160-bit message digest. Whereas MD5 generated message digest of 128 bits.
• The procedure is used to send a non secret but signed message from sender to receiver. In such a case following steps are followed:
1. Sender feeds a plaintext message into SHA-l algorithm and obtains a 160-bit SHA-l hash.
2. Sender then signs the hash with his RSA private key and sends both the plaintext message and the signed hash to the receiver.
3. After receiving the message, the receiver computes the SHA-l hash himself and also applies the sender's public key to the signed hash to obtain the original hash H.
Pgp-Pretty Good Privacy is the open source freely available tool to encrypt your emails then you can very securely send mails to others over internet without fear of eavesdropping by cryptanalyst.
Security Hash Algorithm (SHA) was developed in 1993 by the National Institute of Standards and Technology (NIST) and National Security Agency (NSA).
It was designed as the algorithm to be used for secure hashing in the US Digital Signature Standard.
• Hashing function is one of the most commonly used encryption methods. A hash is a special mathematical function that performs one-way encryption.
• SHA-l is a revised version of SHA designed by NIST and was published as a Federal Information Processing Standard (FIPS).
• Like MD5, SHA-l processes input data in 512-bit blocks.
• SHA-l generates a 160-bit message digest. Whereas MD5 generated message digest of 128 bits.
• The procedure is used to send a non secret but signed message from sender to receiver. In such a case following steps are followed:
1. Sender feeds a plaintext message into SHA-l algorithm and obtains a 160-bit SHA-l hash.
2. Sender then signs the hash with his RSA private key and sends both the plaintext message and the signed hash to the receiver.
3. After receiving the message, the receiver computes the SHA-l hash himself and also applies the sender's public key to the signed hash to obtain the original hash H.
Pgp-Pretty Good Privacy is the open source freely available tool to encrypt your emails then you can very securely send mails to others over internet without fear of eavesdropping by cryptanalyst.
CMACs and MACS based on block ciphers, Digital signatureAdarsh Patel
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Various digital signature schemes ( Elgamal and Schnorr )
this presentation is on block cipher modes which are used for encryption and decryption to any message.That are Defined by the National Institute of Standards and Technology . Block cipher modes of operation are part of symmetric key encryption algorithm.
i hope you may like this.
Modern Block Cipher- Modern Symmetric-Key CipherMahbubur Rahman
Introduction to Modern Symmetric-Key Ciphers- This lecture will cover only "Modern Block Cipher".
Slide Credit: Maleka Khatun & Mahbubur Rahman
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A hash function usually means a function that compresses, meaning the output is shorter than the input
A hash function takes a group of characters (called a key) and maps it to a value of a certain length (called a hash value or hash).
The hash value is representative of the original string of characters, but is normally smaller than the original.
This term is also known as a hashing algorithm or message digest function.
Hash functions also called message digests or one-way encryption or hashing algorithm.
http://phpexecutor.com
In cryptography, a block cipher is a deterministic algorithm operating on ... Systems as a means to effectively improve security by combining simple operations such as .... Finally, the cipher should be easily cryptanalyzable, such that it can be ...
this is about international data encryption algorithm. this is first ever ppt which includes its history, encryption , figure, decryption and application.. do share ur views after viewing it if u like..
CMACs and MACS based on block ciphers, Digital signatureAdarsh Patel
cmcs
MACs based on Block Ciphers
Digital Signature
Properties , Requirements and Security of Digital Signature
Various digital signature schemes ( Elgamal and Schnorr )
this presentation is on block cipher modes which are used for encryption and decryption to any message.That are Defined by the National Institute of Standards and Technology . Block cipher modes of operation are part of symmetric key encryption algorithm.
i hope you may like this.
Modern Block Cipher- Modern Symmetric-Key CipherMahbubur Rahman
Introduction to Modern Symmetric-Key Ciphers- This lecture will cover only "Modern Block Cipher".
Slide Credit: Maleka Khatun & Mahbubur Rahman
Dept. of CSE, JnU, BD.
A hash function usually means a function that compresses, meaning the output is shorter than the input
A hash function takes a group of characters (called a key) and maps it to a value of a certain length (called a hash value or hash).
The hash value is representative of the original string of characters, but is normally smaller than the original.
This term is also known as a hashing algorithm or message digest function.
Hash functions also called message digests or one-way encryption or hashing algorithm.
http://phpexecutor.com
In cryptography, a block cipher is a deterministic algorithm operating on ... Systems as a means to effectively improve security by combining simple operations such as .... Finally, the cipher should be easily cryptanalyzable, such that it can be ...
this is about international data encryption algorithm. this is first ever ppt which includes its history, encryption , figure, decryption and application.. do share ur views after viewing it if u like..
This presentation has information about what do you mean by an algorithm, what is hashing and various hashing algorithms and their applications. Approximate counting Algorithm and their applications, Counting Distinct Elements Algorithm and their applications and Frequency estimation algorithm and their applications . Also, the research papers we referenced.
Information and network security 39 secure hash algorithmVaibhav Khanna
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National Institute of Science and Technology (NIST) published the first Secure Hash Standard SHA-0 in 1993 as Federal Information Processing Standard publication (FIPS PUBS) which two years later was replaced by SHA-1 to improve the original design and added SHA-2 family by subsequent revisions of the FIPS. Most of the widely used cryptographic hash functions are under attack today. With the need to maintain a certain level of security, NIST had selected new cryptographic hash function through public competition. The winning algorithm, Keccak will not only have to establish a strong security, but also has to exhibit good performance and capability to run. In this context, we have analysed SHA-3 finalists along with the used standard SHA-2. The performances of respective algorithms are evaluated by computing cycles per byte. The empirical analysis shows that two SHA-3 finalists viz. Skein and BLAKE perform better which are nearly same as the performance of SHA-2.
PERFORMANCE ANALYSIS OF SHA-2 AND SHA-3 FINALISTSijcisjournal
National Institute of Science and Technology (NIST) published the first Secure Hash Standard SHA-0 in 1993 as Federal Information Processing Standard publication (FIPS PUBS) which two years later was replaced by SHA-1 to improve the original design and added SHA-2 family by subsequent revisions of the FIPS. Most of the widely used cryptographic hash functions are under attack today. With the need to maintain a certain level of security, NIST had selected new cryptographic hash function through public competition. The winning algorithm, Keccak will not only have to establish a strong security, but also has to exhibit good performance and capability to run. In this context, we have analysed SHA-3 finalists along with the used standard SHA-2. The performances of respective algorithms are evaluated by computing cycles per byte. The empirical analysis shows that two SHA-3 finalists viz. Skein and BLAKE perform better which are nearly same as the performance of SHA-2.
PERFORMANCE ANALYSIS OF SHA-2 AND SHA-3 FINALISTSijcisjournal
National Institute of Science and Technology (NIST) published the first Secure Hash Standard SHA-0 in
1993 as Federal Information Processing Standard publication (FIPS PUBS) which two years later was
replaced by SHA-1 to improve the original design and added SHA-2 family by subsequent revisions of the
FIPS. Most of the widely used cryptographic hash functions are under attack today. With the need to
maintain a certain level of security, NIST had selected new cryptographic hash function through public
competition. The winning algorithm, Keccak will not only have to establish a strong security, but also has
to exhibit good performance and capability to run. In this context, we have analysed SHA-3 finalists along
with the used standard SHA-2. The performances of respective algorithms are evaluated by computing
cycles per byte. The empirical analysis shows that two SHA-3 finalists viz. Skein and BLAKE perform better
which are nearly same as the performance of SHA-2.
In this paper, we describe an FPGA H.264/AVC encoder architecture performing at real-time. To reduce the critical path length and to increase throughput, the encoder uses a parallel and pipeline architecture and all modules have been optimized with respect the area cost. Our design is described in VHDL and synthesized to Altera Stratix III FPGA. The throughput of the FPGA architecture reaches a processing rate higher than 177 million of pixels per second at 130 MHz, permitting its use in H.264/AVC standard directed to HDTV.
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1. Message Digest Algorithm : SHA-1
Shiva Ram Dam
MSc Information System Engineering
June 12, 2019
Pokhara University
Nepal
2. Introduction
• SHA1: Secure Hash Algorithm 1
• Designed by the United States National Security Agency
• Produces hash value known as Message Digest
2June 12, 2019 SHA-1 Algorithm
3. Salient Features
• Works for any input message that is less than 264 bits
• produces160 bits length message digest
• Infeasible to retain the original message from the message digest
• Same message digest to be produced from both sender and
receiver
• Purpose: Authentication , not Encryption
• widely used in security applications and protocols, including TLS,
SSL, PGP, SSH, IPSec and S/MIME
3June 12, 2019 SHA-1 Algorithm
5. Abstract view of SHA
• Input to the SHA can be of
arbitrary length.
• Produces fixed length output
(i.e. 160 bits length)
June 12, 2019 SHA-1 Algorithm 5
SHA 1
Arbitrary Length
H(X)
160 bits
X
7. 1. Padding
Process of adding extra bits (i.e. 0
followed after a 1)
June 12, 2019 SHA-1 Algorithm 7
Padding
X (X1, X2, ….Xn)
Compression
Function
512
bits
160 bits
H(X)
160 bits
Fig: Padding of string "abc" in bits
8. 2. Appending length
• After padding, length of the
message is represented in 24
bit
• In total, the string is a multiple
of 512 bits.
June 12, 2019 SHA-1 Algorithm 8
Padding
X (X1, X2, ….Xn)
Compression
Function
512
bits
160 bits
H(X)
160 bits
Fig: Padding of string "abc" in bits, finalized by the length
of the string, which is 24 bits
9. • This 512 bits input to the
compression function
• The message divided into 16
words.
• Each word consists of 32 bits.
• 512/32 =16 words
June 12, 2019 SHA-1 Algorithm 9
Padding
X (X1, X2, ….Xn)
Compression
Function
512
bits
160 bits
H(X)
160 bits
10. 3. Initialize hash buffer
Initial values of Ho are predefined
and stored in registers ABCDE
These initial values are used in
Round 0.
June 12, 2019 SHA-1 Algorithm 10
H Hex values
Ho(A) 01234567
Ho(B) 89ABCDEF
Ho(C) FEDCBA98
Ho(D) 76543210
Ho(E) C3D2E1F0
Source:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
CF
11. 4. SHA Processing
SHA1 has 80 rounds defined.
The Message Scheduler Algorithm
schedules each word to rounds as:
• W0 Round 0
• W1 Round 1
……
• W15 Round 15
• W16 Round 16
…..
• W79 Round 79
June 12, 2019 SHA-1 Algorithm 11
Wt is
calculatedSource:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
Word assigning to rounds:
12. 4. SHA Processing (contd.)
June 12, 2019 SHA-1 Algorithm 12
Source:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
Word assigning to round 0:
13. 4. SHA Processing (contd.)
June 12, 2019 SHA-1 Algorithm 13
Source:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
Word assigning to other rounds:
For others (i.e round 16- 79)
W[t] = S1(w[t-16] XOR W[t-14] XOR W[t-8] XOR W[t-3])
For example: when round is 16,
• W[16] = S1(w[16-16] XOR W[16-14] XOR W[16-8] XOR W[16-3])
• Here W0, W2, W8 and W13 are XORed.
• The output is the new word for round 16.
14. 4. SHA Processing (contd.)
Stages Round
t=1 0 to 19
t=2 20 to 39
t=3 40 to 59
t=4 60 to 79
June 12, 2019 SHA-1 Algorithm 14
Each stage has 20 rounds.
Source:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
Division of stages:
15. 4. SHA Processing (contd.)
At each stage:
June 12, 2019 SHA-1 Algorithm 15
Stage Predefined value of k
t1 K1=0X5A827999
t2 K2= 0X6ED9EBA1
t3 K3=0X8F1BBCDC
t4 K4=0XCA62C1D6
Source:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
Constant values:
16. 4. SHA Processing (contd.)
Each round takes 3 inputs:
• 32 bit word form 512 bit block
(i.e.Wt)
• The values from register
ABCDE
• Constant Kt
June 12, 2019 SHA-1 Algorithm 16
Source:
https://www.researchgate.net/publication/238180532_An_Architecture_for_a
_SHA1_Applied_for_DSA/figures?lo=1
Process in each round:
17. 4. SHA Processing (contd.)
Stage Ft
t1 Ft(B.C,D) = (B AND C) OR ((NOT B)
AND D)
t2 Ft(B.C,D) = B XOR C XOR D
t3 Ft(B.C,D) = (B AND C) OR (B AND D)
OR (C AND D)
t4 Ft(B.C,D) = B XOR C XOR D
June 12, 2019 SHA-1 Algorithm 17
Source: https://en.wikipediaorg/wiki/SHA-1
Ft at different stages:
18. 4. SHA Processing (contd.)
June 12, 2019 SHA-1 Algorithm 18
Source: https://en.wikipediaorg/wiki/SHA-1
• Output of Ft and E are added
• Value in register A is 5 bit circular-left
shifted.
• This then added to previous sum.
• Wt is added
• Kt introduced
• B is circular-left shifted by 30 bits.
New values for next round
At each Round:
Denotes addition module 232
19. 5. The Output
June 12, 2019 SHA-1 Algorithm 19
• The 160 bit output from the final
round is modulo added to the initial
predefined values of Ho at registers
ABCDE.
• Output obtained thus is a 160 bit
hash code.
After Final Round:
InitialvaluesofHo
atABCDE
32 bits 32 bits 32 bits 32 bits 32 bits
H(X)
160 bits