IDEA Calculator

You can use the IDEA Calculator applet displayed below to encrypt or decrypt using IDEA the specified 64-bit (16 hex digit) data value with the 128-bit (32 hex digit) key, with a trace of the calculations.

An example random IDEA test value is: 

Key:        006400c8012c019001f4025802bc0320
Plaintext:  05320a6414c819fa
Ciphertext: 65be87e7a2538aed

Encrypting the plaintext with the key should give the ciphertext, decrypting the ciphertext with the key should give the plaintext.