Relier Pairs Secret WritingVersion en ligne ........... par Tea Cher 1 Cryptography 密码学: 2 Ancient 古老的 3 Alum 明矾 4 Steganography 隐写术 5 Substitution 代换 6 Transposition 换位 7 Secret agent 密探 8 Scalp 头皮 9 Vital information 重要信息 10 Cunning 狡猾 Belonging to a time long past, typically referring to a period in history. The skin covering the top of the head. The practice or study of techniques for secure communication in the presence of third parties. Clever, sly, or crafty in achieving one's goals or solving problems. A chemical compound used for various purposes, including as a mordant in dyeing and as an ingredient in some inks. Critical or essential information that is of utmost importance. The practice of concealing messages or information within other non-secret data. A person who works covertly to gather information or perform espionage activities. The act of replacing one thing with another. The act of changing the position or order of something.