Instruction sequence expressions for the secure hash algorithm SHA-256
نویسندگان
چکیده
The secure hash function SHA-256 is a function on bit strings. This means that its restriction to the bit strings of any given length can be computed by a finite instruction sequence that contains only instructions to set and get the content of Boolean registers, forward jump instructions, and a termination instruction. We describe such instruction sequences for the restrictions to bit strings of the different possible lengths by means of uniform terms from an algebraic theory.
منابع مشابه
Keyed/Unkeyed SHA-2
In the draft FIPS 180-2, NIST published SHA-2 as a new version of secure hash algorithm. SHA-2 offers four secure hash algorithms including SHA-1, SHA-256, SHA-384, and SHA-512. In other words, SHA-2 may have outputs 160, 256, 384, or 512 bits of message digest. However, SHA-2 algorithm uses fixed and predefined parameters in execution. It may be vulnerable to attacks. In this paper, we propose...
متن کاملAlgebraic Fault Attack on the Sha-256 Compression Function
The cryptographic hash function SHA-256 is one member of the SHA-2 hash family, which was proposed in 2000 and was standardized by NIST in 2002 as a successor of SHA-1. Although the differential fault attack on SHA-1compression function has been proposed, it seems hard to be directly adapted to SHA-256. In this paper, an efficient algebraic fault attack on SHA-256 compression function is propos...
متن کاملAn Improved Fast and Secure Hash Algorithm
Recently, a fast and secure hash function SFHA – 256 has been proposed and claimed as more secure and as having a better performance than the SHA – 256. In this paper an improved version of SFHA – 256 is proposed and analyzed using two parameters, namely the avalanche effect and uniform deviation. The experimental results and further analysis ensures the performance of the newly proposed and im...
متن کاملSecure Bio-Cryptographic Authentication System for Cardless Automated Teller Machines
Security is a vital issue in the usage of Automated Teller Machine (ATM) for cash, cashless and many off the counter banking transactions. Weaknesses in the use of ATM machine could not only lead to loss of customer’s data confidentiality and integrity but also breach in the verification of user’s authentication. Several challenges are associated with the use of ATM smart card such as: card clo...
متن کاملPerformance Comparison of Parallel Implementations of Cayley and SHA Hash Functions
Implementing hash functions to run on multi-core computers will reduce its running time. We aim to implement Cayley, SHA-256 and SHA-512 hash functions to run on multicore computers and compare their performances. Cayley hash compresses the input message by hashing one bit at a time using composition of linear equations. SHA-256 and SHA-512 work on message blocks and produce fixed length digest...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- CoRR
دوره abs/1308.0219 شماره
صفحات -
تاریخ انتشار 2013