Legacy Cryptography Under Quantum Siege: Big Tech's Race Against Q-Day

As quantum computing advances accelerate, the cryptographic foundation of modern digital security faces an existential crisis. Legacy algorithms like RSA and MD5, which have protected sensitive data for decades, are vulnerable to quantum attacks through Shor's algorithm, making the race to post-quantum cryptography implementation critical to prevent a catastrophic 'Q-Day' scenario. Big Tech's urgent migration to quantum-resistant algorithms reflects industry recognition that delaying this transition could leave global digital infrastructure dangerously exposed.