Get a Foreign Business Number Online Fast: g100.us
Get a business phone number for any country online in seconds — g100.us gives you calls, SMS, and WhatsApp on one number, across 100+ countries, with flat pricing and no contracts.
Read more →Blog
Guides, tips and explanations
Get a WhatsApp Number Without a SIM Card: g100.us Guide
You don't need a physical SIM card to get a working WhatsApp number anymore — g100.us lets you activate a virtual number for WhatsApp, calls, and SMS from your browser or phone in…
Read more →What to Do the Moment You Realize Your Password Was Leaked
Your password just leaked. The next 30 minutes are your most powerful window to contain the damage. Here's a step-by-step rapid response plan: verify the breach, rotate every reus…
Read more →Choosing a Hash Algorithm: MD5, SHA-1, SHA-256 and Beyond
MD5 and SHA-1 are broken — practically exploitable, not just theoretically weak. This guide surveys common hash functions, explains exactly what "broken" means in each case, and g…
Read more →Understanding Public-Key Cryptography Without the Math
Using the locked-mailbox analogy to demystify RSA-style asymmetric encryption, digital signatures, hashing, and the chain of trust that makes HTTPS work — no math degree required.
Read more →How to Set Up 2FA on Every Account in One Afternoon
It often takes a scare to get serious about two-factor authentication. A reused password turns up in a credential dump from some forgotten forum breach, an…
Read more →What Is Bcrypt and Why Is It Still the Go-To for Passwords?
Bcrypt has been called outdated. It keeps showing up in production anyway. This Q&A breaks down the adaptive cost factor, built-in salting, and why its deliberate slowness still g…
Read more →7 Password Myths That Are Putting You at Risk
From forced 90-day rotations to the myth that symbols make passwords strong — a lot of the advice we've followed for years has been quietly proven wrong. Here's what NIST actually…
Read more →SMS 2FA vs. Authenticator Apps vs. Hardware Keys
SMS 2FA, authenticator apps, and hardware keys each protect you differently — against different attackers, in different ways. Here's an honest comparison of all three on security …
Read more →Salt, Pepper, and Why Your Password Hash Needs Both
Hashing your passwords isn't enough. This deep-dive breaks down what salting and peppering actually do at a technical level, how they defeat rainbow tables and offline attacks, an…
Read more →Why You Should Never Store Passwords in Plain Text
Adobe, RockYou, LinkedIn — real breaches with millions of victims, all rooted in the same mistake: not hashing passwords properly. Here's what went wrong and how bcrypt and Argon2…
Read more →A Beginner's Guide to AES Encryption
AES encrypts your bank transfers, messages, and files every day without fanfare. This plain-language guide breaks down symmetric keys, block ciphers, GCM mode, and why AES-256 has…
Read more →How TOTP Two-Factor Codes Actually Work Under the Hood
TOTP two-factor codes look like magic — your phone and the server generate the same six digits without talking to each other. This deep-dive unpacks RFC 6238 step by step: the sha…
Read more →Hashing vs. Encryption: What's the Real Difference?
Hashing and encryption get treated like interchangeable words in security discussions — they aren't. One is reversible, one isn't, and choosing wrong has caused some of the bigges…
Read more →