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CompTIA Security+ SY0-701 · Domain 2: Threats, vulnerabilities & mitigations

Crypto attacks: downgrade, collision, birthday

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Last reviewed September 25, 2026 · Leer en español

Strong cryptographic algorithms are rarely broken head-on. Attackers instead look for ways around them: forcing systems to use weaker options, exploiting weaknesses in older hash functions, or taking advantage of the mathematics of probability. Security+ names three cryptographic attacks you should recognize: downgrade, collision and birthday attacks. Understanding them explains why old protocols and algorithms are retired, and why configuration matters as much as algorithm choice.

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