<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue";" class="">Terakey(tm) is a cipher that offers confidentiality properties provable from first principles. It employs a shared secret key substantially larger than the anticipated volume of message traffic. Key bytes are extracted pseudo-randomly from the large key, using a message indicator as the seed. The extracted bytes can then be used one-for-one to encrypt message bytes. Terakey allows multiple stations that share the large key to communicate amongst each other without the elaborate bookkeeping required for one time pads. Two messages can occasionally use the same key byte, violating the one-time use restriction. That risk can be quantified and various ways are proposed to deal with it. </div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue"; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue";" class="">Terakey can also provide a mechanism for key distribution that can serve an alternative to quantum cryptography, arguably providing comparable security, with lower cost, easier audit, and compatibility with any communication channel. </div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue";" class=""><br class=""></div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue"; min-height: 14px;" class=""><a href="https://www.researchgate.net/publication/342697247" class="">https://www.researchgate.net/publication/342697247</a></div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue"; min-height: 14px;" class=""><br class=""></div><div style="margin: 0px; font-stretch: normal; line-height: normal; font-family: "Helvetica Neue";" class="">Arnold Reinhold</div></body></html>