Five Eyes Intelligence-sharing Network

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It is a multilateral intelligence-sharing network shared by over 20 different agencies of five English-speaking countries — Australia, Canada, New Zealand, the United Kingdom and the United States.
It is both surveillance-based and signals intelligence (SIGINT).
Its genesis lies in the post-war 1946 UKUSA Agreement, intended as a cooperative arrangement for sharing signals intelligence (SIGINT).
Over time, this partnership has extended its reach, becoming an integral part of global intelligence and security operations.
Intelligence documents shared between the members countries are classified as ‘Secret—AUS/CAN/NZ/UK/US Eyes Only,’ which gave the group its title ‘Five Eyes.
Its scope was limited to “communication intelligence matters only” related to “unrestricted” exchange of intelligence products in six areas:
Collection of traffic; acquisition of communication documents and equipment; traffic analysis; cryptanalysis; decryption and translation; and acquisition of information regarding communication organisations, practices, procedures, and equipment.
The arrangement was later extended to ‘second party’ countries —Canada joined in 1948, while Australia and New Zealand became part of the alliance in 1956.

Q1: What is ‘Decryption?

The conversion of encrypted data into its original form is called Decryption. It is generally a reverse process of encryption. It decodes the encrypted information so that an authorized user can only decrypt the data because decryption requires a secret key or password.

Source:In the world of spycraft, why national interest trumps all