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

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secure embedded/microcontroller crypto using AES-ctr with hmac-sha2

The embedded device is a low-power 8-bit microcontroller (memory usage is constrained to about 10kb code, 1kb ram). As the device is battery-powered and manual service should be minimal, more powerful ...
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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?