Cryptologic History:
Post WW II Soviet Made Low Probability of Intercept Encoder
This Soviet made post WWII burst encoder is designed to be concealed in a pocket. It’s used to write coded signals from a telephone-type dial input onto a stainless steel tape in a cassette for a transmission that is burst at very high rates of speed, making intercept and direction finding very difficult. This pocket encoder was also independent of any power source, making it completely portable. Two of these encoders were purchased from a private collector for just over $3,000.