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The word "cryptography" is derived from the Greek kryptos, meaning hidden. The prefix "crypt-" means "hidden" or "vault," and the suffix "-graphy" stands for "writing." The origin of cryptography is usually dated from about 2000 B.C., with the Egyptian practice of hieroglyphics.

Modern cryptographic algorithms can be implemented using dedicated cryptographic hardware or software running on general-purpose hardware. For various reasons, dedicated cryptographic hardware provides a better solution for most applications.

Cryptography, at its most fundamental level, requires two steps: encryption and decryption. The encryption process uses a cipher in order to encrypt plaintext and turn it into ciphertext. Decryption, on the other hand, applies that same cipher to turn the ciphertext back into plaintext.

Modern cryptography. Encryption in modern times is achieved by using algorithms that have a key to encrypt and decrypt information. These keys convert the messages and data into "digital gibberish" through encryption and then return them to the original form through decryption.

Encryption uses an algorithm and a key to transform an input (i.e., plaintext) into an encrypted output (i.e., ciphertext). A given algorithm will always transform the same plaintext into the same ciphertext if the same key is used.

Algorithm: For Encryption: Take an input plain text and key from the user, reverse the plain text and concatenate the plain text with the key, Copy the string into an array.

Methods of Data Encryption in Android Applications The AES algorithm is a block cipher, which means that it encrypts data in fixed-size blocks. The size of the blocks used in AES is 128 bits. AES uses a secret key of either 128 bits, 192 bits, or 256 bits in length.

Cryptography On this page. Specify a provider only with the Android Keystore system. Choose a recommended algorithm. Perform common cryptographic operations. Read a file. Write a file. ... Implementation complexities. OAEP MGF1 message digest. Deprecated functionality. Bouncy Castle algorithms. ... Supported algorithms.