Tinfoil Chat[1] is a semi-practical application of the one-time pad encryption. The paper mentions the inconvenience of sending the keys: >Another common argu

Tinfoil Chat[1] is a semi-practical application of the one-time pad encryption. The paper mentions the inconvenience of sending the keys: >Another common argument is that unlike symmetric PSKs, OTP keys also eventually run out and users need to exchange another keyfile. The messages of TFC only consume 420 bytes of key material. The drop in the price of storage space has made the issue negligible: A $10 microSD card can store 4GB of keyfiles to encrypt more than 9 million messages, which is in most cases enough for several years or decades. 1. https://www.cs.helsinki.fi/u/oottela/tfc.pdf https://www.cs.helsinki.fi/u/oottela/tfc.pdf