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Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
The pages of a letter would be folded together to form a packet. A sliver cut from a page but remaining attached at one end would be woven multiple times, back and forth, through short slots cut into the folded pages. The paper would then be moistened so that it would swell, locking the pieces together.
The serial number of the page would be sent with the encoded message. The recipient would reverse the procedure and then destroy his copy of the page. The German foreign office put this system into operation by 1923. [11] A separate notion was the use of a one-time pad of letters to encode plaintext directly as in the example below.
The random letters, numbers, and characters in the top-right of your screen is the anti-keylogging window that disguises the actual keys you type on your keyboard with randomly-generated characters. This feature helps prevent criminals from stealing your sensitive data while you're signed into Desktop Gold.
Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that the decrypted information appears as a visual image. One of the best-known techniques has been credited to Moni Naor and Adi Shamir , who developed it in 1994. [ 1 ]
The method creates a chain-reaction when a letter is decrypted, this means that after decrypting a word, the letters of that word can be used to decrypt other words. [ 9 ] Depending on the type of cipher, a brute force attack method can be used, which attempts to use all possible keys for the encryption. [ 10 ]
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