In this section, we will discuss the concept of hashing, an important cryptographic primitive, and its multiple applications in the realm of cyber security.
What is Hashing?
A hash function is a mathematical algorithm that takes an input (or ‘message’) and returns a fixed-size string of bytes, usually in the form of a hexadecimal number. The output is called the hash value or simply, the hash. Some characteristics of a good hash function are:
Common Hashing Algorithms
There are several widely used hashing algorithms with different strengths and weaknesses. Some of the most common ones include:
Applications of Hashing
Hashing is a versatile mechanism and serves many purposes in cyber security, such as:
Data Integrity: Hashing can be used to ensure that a file or piece of data hasn’t been altered or tampered with. Comparing the hash value of the original and received data can determine if they match.
Password Storage: Storing users’ passwords as hashes makes it difficult for attackers to obtain the plain-text passwords even if they gain access to the stored hashes.
Digital Signatures: Digital signatures often rely on cryptographic hash functions to verify the integrity and authenticity of a message or piece of data.
Proof of Work: Hash functions are employed in consensus algorithms like the one used in Bitcoin mining, as they can solve computational challenges.
In conclusion, hashing is a crucial technique in ensuring data integrity and maintaining security in various areas of cyber security. Understanding and adopting secure hashing algorithms is an essential skill for any cyber security professional.