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The modern trend for encryption-only modes is clearly CTR, which has a number of advantages over other modes: no padding is needed (contrary to CBC); the computationally-intensive part can be efficiently performed with the IV (and key) only, before the plaintext or ciphertext is available (contrary to CBC, CFB); the computationally-intensive part can be ...


This is off-topic, but arbitrary binary data can be read as image data using for example the Netpbm family of file formats. For example, here's how to read 10000 bytes of random data as a 100x100 grayscale image: $ cat > image.pgm P2 100 100 255 ^C $ dd if=/dev/urandom of=image.raw bs=10000 count=1 1+0 records ...

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