Absolute 0

Mike’s famous pcaps.
$ cat nonrandom.txt
aaaaaaaaaa
$ od -x nonrandom.txt
0000000 6161 6161 6161 6161 6161 000a
0000013
$ openssl aes-128-cbc -in nonrandom.txt -out encrypted.txt -iter 1
enter aes-128-cbc encryption password:
Verifying — enter aes-128-cbc encryption password:
$ od -x encrypted.txt
0000000 6153 746c 6465 5f5f 7d35 a5ee 437c 084d
0000020 2363 d3c5 9eee 003b aece d921 39af fd1a
0000040
Encryption with obvious patterns isn’t encryption.
sed -Ei 's/\xc0\xa8\x25\xce/\x01\x01\x01\x01/g' fake.pcap
$ sha256sum fake.pcap
dc48ae785492c44da0c8e7c266d70b530b19cbdd33e63f7b0d336195769a436b fake.pcap

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