The problem is that messages communicated in this way are only secret if Alice and Bob use a different one-time pad for each message.
If they use the same one-time pad for several messages, Eve could gain some information about the correspondence between letters of the alphabet and subsequences of bits in the key by relating statistical features of the messages to the way words are composed of letters.
One-time pads, for those not up on their cryptographic history, are the stuff of old school spy sagas.
But, if (as Schneier writes) "all keys are equally likely", the one-time pad must be secure for every key.
So-called quantum key distribution (QKD) would ensure absolute security essentially by letting Alice and Bob pass the key for one-time pad encryption right under the nose of an eavesdropper, "Eve".
The only requirement for using Zendo's One-time pad encryption is users meet in person to exchange pads.
But your three main ones will be those for regular undies, those for thongs and night-time pads.
Night-time pads are pretty self-explanatory (longer, made for lying down), but the other two?
Use the heating pad for short time periods.
"For a time, my house was a crash pad for a wide slice of Russia's cultural minority," Sprague said.
Coming into contact with a tampon or pad for the first time is a beautiful rite of passage.
