Guide
SHA-256 vs MD5: What Developers Should Know
MD5 still appears in legacy checksums, but SHA-256 is the better default for modern integrity workflows.
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Hashing basics
A hash function maps input data to a fixed-length digest. Developers use hashes for comparisons, integrity checks, cache keys, and many protocol-level workflows.
A hash is not encryption. You cannot decrypt a SHA-256 or MD5 digest back to the original input.
MD5 collision weakness
MD5 is considered broken for collision resistance. That means attackers can create different inputs with the same MD5 digest under practical conditions.
MD5 may still appear in old checksums, legacy APIs, or documentation examples, but it should not be selected for modern security-sensitive integrity decisions.
Where SHA-256 fits
SHA-256 is widely used for modern digest and integrity workflows. It is a better default than MD5 for comparing files, creating non-secret content digests, and building test expectations.
Checksums are not password storage
Fast hashes such as MD5 and SHA-256 are not appropriate by themselves for storing passwords. Password storage needs dedicated password hashing algorithms with salts and work factors, such as bcrypt, scrypt, Argon2, or PBKDF2 depending on platform and policy.
FAQ
Should I ever use MD5?
Use MD5 only when you must interoperate with a legacy checksum or documented legacy system. Avoid it for new security-sensitive designs.
Is SHA-256 enough for password storage?
No. SHA-256 is fast, which is bad for password storage. Use a dedicated password hashing algorithm.