A block cipher is a symmetric-key cipher that breaks a plaintext message into segments of fixed length. Each segment, called a plaintext block, consists of a fixed number of plaintext symbols. Using a ...

A proprietary algorithm developed by RSA Data Security, Inc., RC2 is an alternative to DES. The algorithm expands a single message by up to 8 bytes. RC2 is a block cipher that encrypts data in blocks ...

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To decrypt a double transposition, construct a block with the right number of rows under the keyword, blocking off the short columns. Write the cipher in by columns, and read it out by rows.

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Also known as a "cipher," each algorithm uses a randomly ... The more rounds (iterations), the more secure, but slower. Block Key Encryption Size Size Type Author Bits Bits Time** 3DES Diffie ...