'Gilbert Vernam, an engineer with this telecom company, came up with an "unbreakable" cipher, using a random code'
AT&T
UNBREAKABLE: Gilbert Vernam, an engineer with this telecom company, came up with an unbreakable cipher, using a random code
Gilbert Vernam, an engineer with this telecom company, came up with an "unbreakable" cipher, using a random code
Gilbert Vernam, an engineer with this telecom company, came up with an "unbreakable" cipher, using a random code
UNBREAKABLE
AT&T
UNBREAKABLE