Release 1.6.1

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•Last updated Oct 6, 2026

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Update parameter sets based on https://cic.iacr.org/p/1/4/26
openfheorg/openfhe-development#1251 · opened on Aug 11, 2026 · Release 1.6.1
Update FHEW parameter sets based on updated security tables
openfheorg/openfhe-development#1285 · opened on Aug 28, 2026 · Release 1.6.1
1
Update the openfhe lattice estimator and generate new binfhe parameters
openfheorg/openfhe-development#1305 · opened on Sep 8, 2026 · Release 1.6.1
Correctness and optimization pass over the big-integer backends, and deprecate MATHBACKEND 2
openfheorg/openfhe-development#1303 · opened on Sep 8, 2026 · Release 1.6.1
Remove the unused virtual layer from the element classes
openfheorg/openfhe-development#1297 · opened on Sep 7, 2026 · Release 1.6.1
Add functionality for creating automorphism keys at a specified level
openfheorg/openfhe-development#413 · opened on May 17, 2023 · Release 1.6.1
2
Add generation and compression of evaluation keys at a specified level (issue #413)
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#1292 opened Sep 4, 2026 · Updated Sep 28, 2026Draft
Fix EvalAtIndexKeyGen hang on extreme rotation indices
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#1317 opened Sep 15, 2026 · Updated Sep 16, 2026
BFV/BGV EvalAtIndexKeyGen hangs on INT_MIN
openfheorg/openfhe-development#1254 · opened on Aug 12, 2026 · Release 1.6.1
Refactor EvalChebyPS for reduced copies, less adjustment calls, less …
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#1325 opened Sep 16, 2026 · Updated Sep 23, 2026
Fix CKKS composite scaling first modulus falling short of firstModSize
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#1329 opened Sep 16, 2026 · Updated Sep 16, 2026
CKKS COMPOSITESCALINGAUTO can generate a first composite modulus over 5 bits below firstModSize
openfheorg/openfhe-development#1327 · opened on Sep 16, 2026 · Release 1.6.1
StCfirstBoot calls GetScalingFactorRealBig(uint32_t l = 0) with underflow in CKKS
openfheorg/openfhe-development#1323 · opened on Sep 16, 2026 · Release 1.6.1
Throw on out-of-range level in CKKS scaling-factor getters
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#1343 opened Sep 23, 2026 · Updated Sep 23, 2026
Fix a build error in GenerateInteger()
openfheorg/openfhe-development#1360 · opened on Sep 27, 2026 · Release 1.6.1
Fix Clang build error in ternary generator
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#1361 opened Sep 27, 2026 · Updated Oct 7, 2026
Add sparse-encapsulation method for CKKS bootstrapping where uniform secrets are used for the core computation
openfheorg/openfhe-development#1363 · opened on Oct 1, 2026 · Release 1.6.1

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Release 1.6.1

Update parameter sets based on https://cic.iacr.org/p/1/4/26

Update FHEW parameter sets based on updated security tables

Update the openfhe lattice estimator and generate new binfhe parameters

Correctness and optimization pass over the big-integer backends, and deprecate MATHBACKEND 2

Remove the unused virtual layer from the element classes

Add functionality for creating automorphism keys at a specified level

Add generation and compression of evaluation keys at a specified level (issue #413)

Fix EvalAtIndexKeyGen hang on extreme rotation indices

BFV/BGV EvalAtIndexKeyGen hangs on INT_MIN

Refactor EvalChebyPS for reduced copies, less adjustment calls, less …

Fix CKKS composite scaling first modulus falling short of firstModSize

CKKS `COMPOSITESCALINGAUTO` can generate a first composite modulus over 5 bits below `firstModSize`

StCfirstBoot calls GetScalingFactorRealBig(uint32_t l = 0) with underflow in CKKS

Throw on out-of-range level in CKKS scaling-factor getters

Fix a build error in GenerateInteger()

Fix Clang build error in ternary generator

Add sparse-encapsulation method for CKKS bootstrapping where uniform secrets are used for the core computation

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