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SOS Protocol for SMS: Specification

https://sudonull.com/sos-protocol-for-sms-specification

Study the SOS protocol specification for structured text exchange via SMS. Message format, automaton states, checksum and timeouts. For network protocol developers.

CMA investigates Microsoft: SMS for Copilot and Office

https://sudonull.com/cma-investigates-microsoft-sms-for-copilot-and-office

British CMA checks Windows, Teams and Copilot for SMS status. AI access restrictions from April 2026. Consequences for developers and competition — read the details.

Telegram Login Widget: OpenID Connect and authorization without SMS

https://sudonull.com/telegram-login-widget-openid-connect-and-authorization-without-sms

Telegram updated the Login Widget by adding support for OpenID Connect. Now websites can request a phone number and permission to send messages. Learn how it works and what is important for developers.

Bypassing 2FA in the bank: brute-force attack

https://sudonull.com/bypassing-2fa-in-the-bank-brute-force-attack

Pentest breakdown: how a bank's 4-digit SMS code is cracked in 35 sec without limits. API analysis, JS exploit, CWE-307, recommendations. For developers and pentesters.

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