Complex sentence: In cryptography, the International Data Encryption Algorithm (IDEA) is a block cipher designed by Xuejia Lai and James L. Massey of ETH-Zürich and was first described in 1991, and was intended as a replacement for the Data Encryption Standard.
Split into simpler sentences: In cryptography, the International Data Encryption Algorithm (IDEA) is a block cipher designed by Xuejia Lai and James L. Massey of ETH-Zürich and was first described in 1991. The algortihm was intended as a replacement for the Data Encryption Standard.