Importance

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Abstract

ELT transformation circuits 101.sub.1 to 101.sub.m are preliminarily supplied with ELT transformation parameters a.sub.i, b.sub.i, and p.sub.i (i=1, 2, . . . , m). When a plaintext of n bits long is supplied to the ELT transformation circuit 101.sub.1 via an input terminal 104, the ELT transformation circuit 101.sub.1 carries out ELT transformation on the plaintext by the use of ELT transformation parameters a.sub.1, b.sub.1, and p.sub.1 supplied from an input terminal 105.sub.1. An enciphering circuit 102.sub.1 enciphers an n/2-bit input with reference to a cryptographic key K.sub.1 from an input terminal 106.sub.1. Supplied with two n-bit inputs, an exclusive-OR circuit 103.sub.1 carries out an exclusive-OR operation between every corresponding bits of the same order. Subsequently, similar operation as mentioned above is repeated. The ELT transformation circuit 101.sub.m at a final stage delivers a ciphertext to an output terminal 107.

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First Claim