Curious-Techie Learn

SHA-512 is fundamentally more secure and surprisingly runs faster on modern 64-bit CPUs than SHA-256 due to native 64-bit word operations. Choose SHA-256 for compact output and microcontrollers; choose SHA-512 for high-security applications and 64-bit server pipelines.

You cannot decode a cryptographic hash because hashing is a lossy, one-way mathematical function. A hash compresses arbitrary-sized data (e.g. an entire 4 GB operating system image) into a fixed 256 bits, discarding original information and making mathematical reversal impossible.

The Avalanche Effect is a fundamental cryptographic property where altering a single input bit causes approximately 50% of the output digest bits to change unpredictably, preventing attackers from predicting output digests or reverse-engineering input patterns.

No, MD5 is completely broken for security purposes due to practical collision attacks where attackers generate two distinct files with identical MD5 checksums. It should never be used for passwords, SSL certificates, or digital signatures.

DoH is superior for user privacy and censorship circumvention because its traffic blends inseparably with standard HTTPS web browsing on port 443. DoT is superior for enterprise network administration because dedicated port 853 allows network security teams to inspect or filter queries.

Base64 is 33% more compact than Hexadecimal for binary transport (33% size overhead vs 100% size overhead). Use Base64 for images, attachments, and data URIs. Use Hexadecimal for cryptographic hashes, byte inspection, and color codes where human readability and character safety are paramount.

Use Server Session Cookies for standard monolithic web applications and Single Page Applications sharing a backend domain. Use JWTs for distributed microservices, multi-region API gateways, and short-lived mobile authorization handshakes where database lookups on every request are prohibitive.