SHA-256 vs MD5 Collision Handling & Performance Simulation

1. What is a Collision Attack?

A collision occurs when two different inputs produce the same hash output. A cryptographically secure hash must make finding collisions computationally infeasible.

MD5 has known real-world collisions. SHA-256 currently has no practical collision attacks.

2. SHA-256 vs MD5: Hash Generator

Type text below and compare how MD5 and SHA-256 generate different hashes.

MD5:
SHA-256:

3. Performance Test (Client-Side)

Enter 5 different text inputs to see how hash generation time varies for each algorithm. The test will run 10 iterations per input for accurate results.

Performance Comparison - Line Graph

How the Graph is Plotted:

Justification Report: Why SHA-256 is Better
MD5 (Deprecated)

Hash Length: 128 bits

Security: BROKEN (collisions found in 2004)

Status: Deprecated by NIST

Real Attacks: Multiple (e.g., Flame malware 2012)

Performance: Faster

Modern Use: Legacy checksums only

SHA-256 (Recommended)

Hash Length: 256 bits

Security: No known collisions

Status: NIST approved (FIPS 180-4)

Real Attacks: None

Performance: Slightly slower (~30%)

Modern Use: Bitcoin, SSL/TLS, Code signing

VERDICT: SHA-256 is the clear winner. While MD5 is slightly faster, it's cryptographically broken and unsuitable for any security application. The minimal performance cost of SHA-256 is a worthwhile trade-off for robust, proven security.

4. Conclusion

MD5 is faster but insecure due to proven collisions. SHA-256 is slightly slower but secure against collision attacks.