# Order of Automorphism and Key-Switching in OpenFHE’s EvalAutomorphism (C++)

**URL:** <https://openfhe.discourse.group/t/order-of-automorphism-and-key-switching-in-openfhe-s-evalautomorphism-c/2123>\
**Category:** Library Questions\
**Created:** [August 2, 2025, 11:52am UTC](https://openfhe.discourse.group/t/order-of-automorphism-and-key-switching-in-openfhe-s-evalautomorphism-c/2123 "2025-08-02T11:52:43Z")\
**Posts on this page:** 1\
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**Author:** ![ypolyakov](https://yyz1.discourse-cdn.com/flex031/user_avatar/openfhe.discourse.group/ypolyakov/32/47_2.png) [@ypolyakov](https://openfhe.discourse.group/u/ypolyakov)\
**Post date:** [August 3, 2025, 1:31am UTC](https://openfhe.discourse.group/t/order-of-automorphism-and-key-switching-in-openfhe-s-evalautomorphism-c/2123/2 "2025-08-03T01:31:09Z")

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See the solutions for [CKKS-RNS Automorphism before key-switching leads to excessive noise and decryption failure](https://openfhe.discourse.group/t/ckks-rns-automorphism-before-key-switching-leads-to-excessive-noise-and-decryption-failure/1524) and [EvalAutomorphismKeyGen ModInverse index](https://openfhe.discourse.group/t/evalautomorphismkeygen-modinverse-index/1801)

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