In 1851, A Man Picked Two Unpickable Locks and Changed Security Forever.Changed Security Forever
The pursuit of lock picking is as old as the lock, which is itself as old as civilization. But in the entire history of the world, there was only one brief moment, lasting about 70 years, where you could put something under lock and key—a chest, a safe, your home—and have complete, unwavering certainty that no intruder could get to it.
This is a feeling that security experts call “perfect security.”
In the computer industry, the term security -- or the phrase computer security -- refers to techniques for ensuring that data stored in a computer cannot be read or compromised by any individuals without authorization. Most computer security measures involve data encryption and passwords
Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext.
Asymmetric cryptography, also known as public key cryptography, uses public and private keys to encrypt and decrypt data. The keys are simply large numbers that have been paired together but are not identical (asymmetric). One key in the pair can be shared with everyone; it is called the public key.