Excerpt§
AES-256 and SHA-256 play important roles in data security but serve different purposes. AES-256 provides encryption while SHA-256 enables hashing. This article explains what each one does, compares them, and illustrates why AES-256 and SHA-256 are not interchangeable.
AES-256 and SHA-256 are two common standards used in cryptography and cybersecurity. Their similar naming conventions sometimes cause confusion about whether they are the same thing. However, AES-256 and SHA-256 are actually quite different in terms of their purpose, functionality and how they work. In this post, we’ll clarify what each one is, compare them, and illustrate why AES-256 and SHA-256 are not interchangeable.
Introduction§
AES-256 and SHA-256 play important roles in securing data both in transit and at rest. AES-256 refers to a symmetric encryption algorithm that provides confidentiality of sensitive data. SHA-256 is a cryptographic hash function that ensures integrity and authenticity. While both utilize advanced mathematics, AES-256 and SHA-256 serve different core functions. Understanding their distinct purposes is key to leveraging them together for robust data security.
AES-256§
AES-256 or Advanced Encryption Standard 256-bit is a symmetric encryption standard used worldwide. Here are some key facts about it:
Published in 2001 by the U.S. National Institute of Standards and Technology (NIST).
Uses a 256-bit secret key to encrypt and decrypt data in fixed block sizes.
Relies on substitution, permutation and other transformations to scramble plaintext.
Provides strong confidentiality for sensitive data in transit or storage.
Used in many protocols and technologies like WiFi security, encrypted data storage, online payments etc.
AES-256 is recognized for its high speed, security and ubiquity in modern encryption needs.
SHA-256§
SHA-256 or Secure Hash Algorithm 256-bit is a widely used cryptographic hash function. Its main characteristics are:
Developed by the NSA, published in 2001 as part of the SHA-2 family.
Generates a condensed 256-bit hash value representation of the input data.
Uses compression functions and logical bitwise operations to produce hashes.
Provides integrity assurances and digital fingerprinting through cryptographic security.
Utilized in blockchain, digital certificates, version control systems, and more.
SHA-256 enables verifying the authenticity and integrity of data in a broad range of applications.
Differences Between AES-256 and SHA-256§
Despite their similar names and bit lengths, AES-256 and SHA-256 are fundamentally different:
Purpose – AES-256 provides encryption, SHA-256 performs hashing. Encryption aims for confidentiality, hashing enables integrity assurances.
Process – AES-256 relies on symmetrical key algorithms. SHA-256 uses hash functions based on compression and logical operations.
Reversibility – Encryption is two-way and AES-256 can decrypt data. SHA-256 is a one-way hash that cannot be reversed.
Key Usage – AES-256 requires a secret key. SHA-256 does not use keys.
Output - AES-256 outputs seem random. SHA-256 outputs appear pseudorandom but have structure.
Conclusion§
In summary, AES-256 and SHA-256 are two distinct cryptographic standards designed for different purposes. AES-256 performs encryption to provide confidentiality of sensitive data, while SHA-256 generates hash values that ensure integrity and authentication. Their underlying mechanisms, applicability and guarantees differ as well. Understanding that AES-256 and SHA-256 are not interchangeable or the same thing is crucial to leveraging them both securely.
