Not even encryption will prevent your messages from
> being read, if the LEA really want to read them bad
> enough.
Depends on the encryption. Properly applied, one-time pad encryption cannot be cracked. The mathematics are clear (and beyond the scope of this newsgroup), but you might consider how to create an algorithm to crack encryption that wasn't generated by an algorithm in the firs place.
All examples of one-time pad encryption being cracked (e.g. Venona) are the result of agents misusing key data.
Laura Halliday VE7LDH "Que les nuages soient notre Grid: CN89mg pied a terre..." ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte