Cryptographic Security 101: Creating Strong Passwords and UUIDs

Introduction to Cryptographic Randomness

Most developers know how to write random functions, but they often use standard pseudo-random number generators (PRNGs) like Math.random(). For security-critical applications, PRNGs are predictable. True cryptographic randomness relies on secure entropy sources provided by the OS.

Passwords: Length vs. Complexity

Many websites require complex rules (symbols, numbers, uppercase). However, math shows that length is a more effective security barrier than complexity alone.

• A 10-character password with letters, numbers, and symbols has an entropy of roughly 65 bits.
• A 16-character password with lowercase letters alone has an entropy of roughly 75 bits.

To generate cryptographically secure passwords locally on your machine, use our Password Generator tool, which utilizes the web crypto API (crypto.getRandomValues).

Universally Unique Identifiers (UUIDs)

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify records in a database.

• UUID v4: Generated using pure random numbers. The chance of a collision is mathematically near-impossible—even if you generate 1 billion UUIDs per second for 100 years, the probability of a duplicate is less than one in a billion.
• Formatting: UUIDs are standard 36-character strings (32 hexadecimal characters and 4 hyphens).

Use our UUID Generator to instantly generate single or bulk UUIDs for database seeding, product IDs, or API keys.

Conclusion

Understanding cryptographic security allows you to write secure applications. Protect your systems by generating secure keys and utilizing standardized unique IDs.