In cryptography, SEAL (Software-Optimized Encryption Algorithm) is a very fast stream cipher optimised for machines with a 32-bit word size and plenty of RAM. SEAL is actually a pseudorandom function family in that it can easily generate arbitrary portions of the keystream without having to start from the beginning. This makes it particularly well suited for applications like encrypting hard drives.
The first version was published by Phillip Rogaway and Don Coppersmith in 1994. The current version, published in 1997, is 3.0. SEAL, covered by two patents in the United States, both of which are assigned to IBM.
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“The denial of our duty to act in this case is a denial of our right to act; and if we have no right to act, then may we well be termed “the white slaves of the North,” for like our brethren in bonds, we must seal our lips in silence and despair.”
—Angelina Grimké (1805–1879)