Hironobu Nakamura proposes using microorganisms as a material to store and decrypt secret information. He suggests the following: 1. Store a secret key used to decrypt some information in the DNA of microbes through genetic engineering. 2. Sequence the microbe DNA to extract the secret key. 3. Use the secret key to decrypt or regenerate the original information. The idea is to use life itself as an information storage material by encoding data in the DNA of microbes. The information could potentially be retrieved by sequencing the microbes' DNA and decrypting the data with the extracted secret key.