Nevertheless, these investigations revealed that the safety margin of the Enigma cipher machine had to be reduced from 50,000 to 20,000 letters on a day's cipher (an experience which resulted in the daily cipher, which at the beginning of the Russian campaign was very heavily burdened, being split up into two or three portions). As the final result of the investigations described above, the value of carrying out investigations into machine ciphers of enemy nations was recognised and the process undertaken.