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Select the main reason why proprietary encryption algorithms are not recommended.
They are harder to implement than standard encryption algorithms.
Interoperability issues may arise.
They are harder to implement than standard hashing algorithms.
They are not reviewed by the public.
The lack of public review allows weaknesses in the encryption algorithm which may make their usage insecure. Source: https://www.owasp.org/index.php/GuidetoCryptography
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