A system, device and method for encrypting plaintext information securely. The system includes a transmitting agent to generate and synchronize a first cipher stream using the plaintext information and a first key, to generate and synchronize a second cipher stream using a second key and a randomizing function to randomize and synchronize a controllable plaintext stream to form a second synchronized cipher stream, and to operate on the plurality of first and second cipher streams using an exclusive disjunction operator to obtain a ciphertext stream; and a receiving agent to decrypt the ciphertext stream.

 
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< Signature generation apparatus and signature verification apparatus

< Management of physical security credentials at a multi-function device

> Authentication of an object using a signature part

> Printing management system, printing apparatus, print information output apparatus, and printing method

~ 00620