There is another big problem with mandatory decryption laws. If someone want to incriminate you, they don't need to plant a file with child porn anymore: they

There is another big problem with mandatory decryption laws. If someone want to incriminate you, they don't need to plant a file with child porn anymore: they just need to plant a file composed of random bytes and acuse you of having encrypted child porn there. Now good luck providing the court an encryption key that does not exist.