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Cryptography prior to the modern age was effectively synonymous with encryption , converting readable information plaintext to unintelligible nonsense text ciphertext , which can only be read by reversing the process decryption. The sender of an encrypted coded message shares the decryption decoding technique only with the intended recipients to preclude access from adversaries.
The cryptography literature often uses the names "Alice" or "A" for the sender, "Bob" or "B" for the intended recipient, and "Eve" or "E" for the eavesdropping adversary. Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions , making such algorithms hard to break in actual practice by any adversary. While it is theoretically possible to break into a well-designed system, it is infeasible in actual practice to do so.
Such schemes, if well designed, are therefore termed "computationally secure". Theoretical advances e. Information-theoretically secure schemes that provably cannot be broken even with unlimited computing power, such as the one-time pad , are much more difficult to use in practice than the best theoretically breakable but computationally secure schemes.
The growth of cryptographic technology has raised a number of legal issues in the Information Age. Cryptography's potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export. The first use of the term "cryptograph" as opposed to " cryptogram " dates back to the 19th century—originating from " The Gold-Bug ", a story by Edgar Allan Poe.
