Yes it is, all it takes is computer time.
Not quite true. If the key is truly random (not the pseudo-random you get from a digital computer) and is used only once (i.e. one-time pad) it cannot be broken. That doesn't mean the message can't be guessed, but the decoder can never be sure the message was decoded properly.
I've investigated the randomness of sequences of numbers taken from the phone book, and from sources such as the STATISTICAL ABSTRACT OF THE UNITED STATES, and they are sufficiently random to be used as one-time pads. For the phone book, use the last two digits of phone numbers, working down the page. From a source of statistical data such as the STAT ABSTRACT, ignore the final digit (it's been rounded, which may degrade randomness), and use the next-to-last and the next-to-next-to-last digits. Exclusive-or them with the text of the message to get the encrypted message. Recover the message by exclusive-oring the key with the encrypted message.
USE THE RANDOM KEY ONLY ONCE! (And yes, I mean to shout!)
You need to have some means of informing the recipient of such thing as page number, starting line, etc.
Remember that even if the message can't be decrypted by "them," the fact that you're sending an encrypted message is itself suspicious.
>> Remember that even if the message can’t be decrypted by “them,” the fact that you’re sending an encrypted message is itself suspicious.
Maybe we all need to send encrypted communications periodically, just to get “them” used to seeing it and drive them nuts.
For the same reason, I’m wondering how long before walking around in public in a “designer disguise” becomes chic — because of all the hidden cameras. Not so much here (yet), but I understand that Britain is positively awash in public cameras.
(Oh by the way:
jaic;
wpoei
uxhc-
lfuib
aer;b
0-pec
964gy !)