Data encryption translates data into another form, or code, so that only people with access to a secret key or password can read it. Encrypted data is commonly referred to as ciphertext, while unencrypted data is called plaintext.
The Greek force crept out of the horse and opened the gates for the rest of the Greek army, which had sailed back under cover of night. The Greeks entered and destroyed the city of Troy, ending the war.
Pretty Good Privacy was developed by Phil Zimmerman back in 1991, who wanted to create an open source encryption platform that could be used by anyone across the world, without having to pay huge fees.