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