Information and network security 40 sha3 secure hash algorithm

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The document discusses the development of SHA-3, a new hash function proposed by NIST to replace SHA-2 due to concerns about the security of older algorithms like SHA-1 and MD5. SHA-3 must meet specific requirements, including compatibility with SHA-2, processing small blocks, and providing high security while being efficient in time and memory. The document outlines evaluation criteria for SHA-3, emphasizing security, efficiency, and algorithm characteristics such as flexibility and simplicity.

Information and Network Security:40
SHA 3 Secure Hash Algorithm
Prof Neeraj Bhargava
Vaibhav Khanna
Department of Computer Science
School of Engineering and Systems Sciences
Maharshi Dayanand Saraswati University Ajmer

SHA-3
• SHA-1 not yet "broken”
• but similar to broken MD5 & SHA-0
• so considered insecure
• SHA-2 (esp. SHA-512) seems secure
• shares same structure and mathematical operations as
predecessors so have concern
• NIST announced in 2007 a competition for the SHA-3
next gen NIST hash function
• goal to have in place by 2012 but not fixed

SHA-3
• As yet, SHA-1 has not yet been "broken".
• That is, no one has demonstrated a technique for producing collisions
in less than brute-force time.
• However, because SHA-1 is very similar in structure and in the basic
mathematical operations used to MD5 and SHA-0, both of which have
been broken, SHA-1 is considered insecure and has been phased out
for SHA-2.

SHA-3
• SHA-2, particularly the 512-bit version, would appear to provide
unassailable security.
• However, SHA-2 shares the same structure and mathematical
operations as its predecessors, and this is a cause for concern.
• Because it will take years to find a suitable replacement for SHA-2,
should it become vulnerable, NIST decided to begin the process of
developing a new hash standard.

SHA-3
• Accordingly, NIST announced in 2007 a competition to produce the
next generation NIST hash function, to be called SHA-3.
• NIST would like to have a new standard in place by the end of 2012,
but emphasizes that this is not a fixed timeline.

SHA-3 Requirements
replace SHA-2 with SHA-3 in any use
so use same hash sizes
preserve the online nature of SHA-2
so must process small blocks (512 / 1024 bits)
evaluation criteria
security close to theoretical max for hash sizes
cost in time & memory
characteristics: such as flexibility & simplicity

SHA-3 Requirements
• The basic requirements that must be satisfied by any candidate for
SHA-3 are:
• It must be possible to replace SHA-2 with SHA-3 in any application by
a simple drop-in substitution. Therefore, SHA-3 must support hash
value lengths of 224, 256, 384, and 512 bits.
• SHA-3 must preserve the online nature of SHA-2. That is, the
algorithm must process comparatively small blocks (512 or 1024 bits)
at a time instead of requiring that the entire message be buffered in
memory before

SHA-3 Requirements
• Beyond these basic requirements, NIST has defined a set of
evaluation criteria. These criteria are designed to reflect the
requirements for the main applications supported by SHA-2, and are:
• • Security: The strength of SHA-3 should be close to the theoretical
maximum for the different required hash sizes, and for both preimage
resistance and collision resistance. SHA-3 algorithms must be
designed to resist any potentially successful attack on SHA-2 functions

SHA-3 Requirements
• • Cost: be both time and memory efficient over a range of hardware
platforms.
• • Algorithm and implementation characteristics: such as flexibility
(e.g., tunable parameters for security/performance tradeoffs,
opportunity for parallelization, and so on), and simplicity (which
makes it easier to analyze the security properties of the algorithm)

Assignment
• What is SHA 3 Secure Hash Algorithm
• Discuss the requirements of SHA 3

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