ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,231,534, issued on Feb. 18.

"Cryptographic innocence box" was invented by Gideon Samid (Rockville, Md.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Using composite cipher technology building a single ciphertext C that will decrypt to the true (hot) plaintext Ph using key Kh, and to plaintext Pjnot equal toPh using key Kjnot equal toKh, thereby a single file C will carry any number of distinct plausible messages where an attacker cannot sort them out, but the intended reader who knows which key is Kh will decrypt the ciphertext C to Ph. Encryption and Decryption happens in a stand-alone, not Internet connected box-the Innocence Box."

The patent was fi...