Abstract: A method according to an example of the present disclosure includes, obtaining an encrypted version of a shared reference file that is shared by a group of one or more confidants, receiving a request from a particular confidant in the group to encrypt a data segment for the group, and selecting a portion of the encrypted version of the shared reference file as an encryption key for the request. The selecting is performed based on a date and time of the request. The encryption key is used to encrypt the data segment. A computing device and computer program product are also disclosed.

Abstract: An example method of cryptographically modifying an input data segment includes performing, in a first stage, a first bit substitution operation based on a first stage input segment and a first cryptographic key sequence. The method also includes performing, in a subsequent second stage, a bit dispersal based on a second stage input segment and a second cryptographic key sequence. The method also includes performing, in a subsequent third stage, a second bit substitution operation based on a third stage input segment and a third cryptographic key sequence. The first, second, and third stage input segments are all derived from the input data segment.

Abstract: A system and method of compression indexing and efficient proximity search of text data permits high speed search featuring ranking the relevance of search results according to closeness of desired terms within each portion of text found. The system includes (a) preparing target text, (b) creating a “compression index ebook”, (c) browsing in a compression index ebook, and (d) searching in a compression index ebook. To create the compression index, the method includes the steps of selecting target text, identifying tokens, such as words and punctuation strings, wherein each of the tokens has a frequency. The frequencies of each token are counted. Tokens are ranked from highest frequency to lowest frequency. The frequencies are compressed. The next step is assigning positions to each token frequency and compressing the positions to form a compression index ebook, which is stored in random access memory to eliminate disk seeks during browsing and searching.