Counter Mode (CTR) is an encryption mode, that builds a random-access stream-cipher from a block-cipher.

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Multi cipher CTR

What is your opinion on this scheme: 1)get IV from CSPRNG 2)set 3 encryption keys k1,k2,k3 (3*key_lenght) (KDF/PBKDF) 3)Use 3 ciphers in CTR mode like this: The initial IV is encrypted using ...
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Using the same IV instead of random for CTR mode? [duplicate]

Why is it a bad idea to use the same IV instead of random one for CTR mode?