Privacy

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A place to discuss privacy and freedom in the digital world.

Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.

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Why every TOTP app default uses SHA-1 hash encryption? (lemmy.world)

submitted 1 month ago by [email protected] to c/[email protected]

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I use Aegis as my 2fa. Today on new token creation I observed that there's hash function set to SHA-1, later checked all my tokens and the result is same type of encryption used for all. So I have edited all my tokens to SHA-256 as a result my totp doesn't authenticate. Do I have to rescan my tokens for updating to SHA-256 or it doesn't work like that?

Security: SHA-1 < SHA-256 < SHA-512

Speed: SHA-1 > SHA-256 > SHA-512

My doubts are: Why can't we use SHA-256? Is it because TOTP requires less time so faster one(SHA-1) is chosen? Can we use SHA-256 for TOTPs?

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[–] [email protected] 4 points 1 month ago

You should be using bcrypt or something similiarly designed to hash passwords, since they are much safer than sha256/512. Sha is not designed for hashing passwords and therefore a fast algorithm which you shouldn't use for passwords