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Pontifex

Golang solitaire cypher from Cryptonomincon designed by Bruce Schneier

More info https://www.schneier.com/academic/solitaire/

Quick start

  1. Generate a sample key from the default deck key...

go run main.go -op dkey

this will make a base64 encoded key in a file called shared.key

  1. or use and/or edit deck.txt to make a new key deck (it is not validated in any way) generate a key from this deck:

go run main.go -op key -k my.key -i deck.txt

  1. encrypt some text with the shared.key, for example encrypt the example in.txt

go run main.go -op enc -k shared.key -i in.txt -o enc.txt

cat the encoded text:

cat enc.txt

UPLOP IMCPO GIGJL LGSAX
GGGBS GXXLX
  1. decrypt enc.txt with the shared.key:

go run main.go -op dec -k shared.key -i enc.txt -o denc.txt

Thats all there is to it.

Testing

The benchmark shows that we can generate 5.6e7 key stream values in 20 seconds, so should be pretty useful for randomness analysis (see Schneiers page for links regarding this)

License

This code is explicitly in the "public domain" and can be used, reused, and abused as desired.

THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.