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mcrypt selects a default from one of its possible encryption algorithms if one isn't explicitly named. mcrypt --list shows all available algorithms, but doesn't mark which one is default. Neither encrypting nor decrypting a file output which algorithm is being used. So, how do I figure out the default?

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The latest versions of file will tell you the algorithm used on a file encrypted by mcrypt:

$ mcrypt foo.bar

$ file foo.bar.nc

foo.bar.nc: mcrypt 2.5 encrypted data, algorithm: rijndael-128, keysize: 32 bytes, mode: cbc,

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