Deprecated Algorithms: Why MD5 and SHA-1 Get Breached
Real-world breaches caused by deprecated crypto algorithms, what makes an algorithm deprecated, and the migration playbook.
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Tags: security, cryptography, mistakes
Using Deprecated Algorithms: DES, RC4, MD5, and SHA-1 Risks Not all deprecated algorithms are equally dangerous. MD5 for a software download checksum on an internal tool is meaningless from a security perspective. MD5 for password storage is catastrophic. RC4 in a TLS negotiation exposes sensitive session data to passive eavesdroppers. Understanding why an algorithm is deprecated — and what the actual risk is in your specific context — is the difference between fixing real problems and chasing phantom ones. Why Algorithms Get Deprecated Algorithms are deprecated when one or more of these conditions are met: Practical attacks exist: A collision, preimage, or key recovery attack has been demonstrated Key size is insufficient: The key space has shrunk relative to computational capabilities…
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