Why websites shouldn't decrypt your password
If a service can decrypt passwords, that's a red flag. Good password systems usually don't need this capability at all.
Why decipherability is problematic
A password is not a document that a service has to read again later. To register, all you need to do is compare a safe derivation.
If a provider can retrieve the password, there is always the risk that attackers or internal misconfigurations will also benefit from it.
How to recognize problematic systems
- A service can send you your old password in plain text.
- Support or processes suggest that the original password is known.
- Technical documentation speaks of decryption rather than secure password hashing.
What users and operators should learn from this
Users should be particularly careful with such signals and never reuse passwords. Operators should consistently replace reversible storage.
In security assessments, this is a strong indication of fundamental architectural weaknesses.
Quick checklist
The most important actions from this guide in compact form.
- Never reuse passwords across multiple services, especially on questionable systems.
- Use non-reversible password storage during development.
- Take warning signals such as plain text reminders or old support processes seriously.
Common questions
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How do websites really store passwords?
If you want to keep going, this is the next guide to read.
Reputable websites do not store passwords in plain text, but rather as hashed values with additional protection mechanisms such as salt and modern password hashing procedures.