Aid for a decoder

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it’s A 17 letters crossword definition.
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Last seen on: NY Times Crossword 29 Jul 20, Wednesday

Random information on the term “KEY”:

In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm. For encryption algorithms, a key specifies the transformation of plaintext into ciphertext, and vice versa for decryption algorithms. Keys also specify transformations in other cryptographic algorithms, such as digital signature schemes and message authentication codes.

In designing security systems, it is wise to assume that the details of the cryptographic algorithm are already available to the attacker. This is known as Kerckhoffs’ principle — “only secrecy of the key provides security”, or, reformulated as Shannon’s maxim, “the enemy knows the system”. The history of cryptography provides evidence that it can be difficult to keep the details of a widely used algorithm secret (see security through obscurity). A key is often easier to protect (it’s typically a small piece of information) than an encryption algorithm, and easier to change if compromised. Thus, the security of an encryption system in most cases relies on some key being kept secret.

KEY on Wikipedia