Bruce Schneier

If I had a letter, sealed it in a locked vault and hid the vault somewhere in New York. Then told you to read the letter, that’s not security, that’s obscurity. If I made a letter, sealed it in a vault, gave you the blueprints of the vault, the combinations of 1000 other vaults, access to the best lock smiths in the world, then told you to read the letter, and you still can’t, that’s security.