software encryption algorithm (cipher) (SEAL)

The Software Encryption ALgorithm (SEAL) is an encryption method developed by IBM.

The SEAL encryption is a random stream encryption that works with a key length of 160 bits. With the SEAL method, the streaming data is first included in an internal table. With SEAL, the 32-bit position indices are extended into a long string that is linked to the plaintext via an XOR operation. When SEAL is used with 32-bit processors, the message can be encrypted with four clock cycles per byte. In contrast to SEAL, the DES algorithm requires about ten clock cycles for one text byte.